In the example of the electromagnetic wave with perpendicular E and B fields, you say the wave propagates to the right. Based on the way you drew it, that's not actually the case. E cross B gives the direction of velocity and so in your example the wave propagates to the left (negative x direction).
Instead of criticizing and correcting which is easy and anyone can do, why don’t you make a better video? This young man has made an effort to explain electromagnetic waves and help improve everyone else. Try to do the same instead of finding fault please. It’s much harder to create things, but it will make you proud of yourself in the end. I’m sure you can do it.
I believe that X coordinate @3:55 should be a time coordinate if this graph is to show self-propagation. Using a distance coordinate creates a graph showing the two fields frozen in time, and therefore shows the oscillation of the producing charge instead.
Yes I agree as well. The E and B fields are backwards. The right hand rule states if you start your right hands fingers in the E direction and CURL to the magnetic field, your thumb will naturally point in the direction of propagation. The YELLOW should be Electric Field. The RED should be Magnetic field. Great video though!
Also where one field is changing at max rate (crossing zero) the orthogonal field should be at max amplitude...the picture is wrong. Electric and magnetic fields never cross at zero together, one field should be (phase) shifted by a quarter cycle in the drawing.
I know I'm commenting on a 9 yr old video but it's got to be said - thank you so much! I was looking for the resource that could reconcile my understanding of electromagnetism in wires and magnets and electromagnetism when speaking about light and radio waves. And here it was posted nearly a decade earlier, a little over 10 minutes long. You absolutely smashed it. Thanks again.
Salman amigo : intercambia la rotulacion de E y B en las graficas para que la direccion de la propagacion cumpla la regla de la mano derecha. Saludos desde Honduras y apreciamos este gran esfuerzo y proyecto de transmitir conocimientos a la humanidad!
I think the wave direction should be the opposite direction, when using right-hand rule, the finger tips conserving from E to B, the thumb shows the wave direction, which is left
MMM, to see if i understood. EM Wave is the way how energy tralves through vacuum. While increse the velocity of wave the length decrease. So WiFi wave wave transport energy(On/Off) when is up 1 or 0 is down?
Today AM is used more for UHF radiosignals and FM in the VHF area. Due to the fact that frequency modulation becomes tricky with higher frequencies. Opposite to what you said.
Visible=visible to normal human eye. All ranges are visually visible. My brother can clearly see infrared in day light, had tested him many times by various types of IR remote controls even with dead batteries. EM waves travelling through the empty space without media is quantum physics.
@Henry HUNG [07N15M] and here is my 3 yr old sis watchin this with me and asking me questions like what is electromagnetic??? and oh the way she is pronouncing it is way too funny
+Andrew Yang That doesn't matter. Light can be polarized in any direction. Up down left and right are completely relative. As long as the fields are perpendicular there is nothing wrong with what he drew. For example if you rotated the light and shifted it back by one period it would look exactly like what you described or might see in a textbook.
+Wilfredo1242 Well in general, if the wave is propagating in a normal medium, the direction of wave propagation is always in the E X H direction, which means the video has it wrong. We aren't dealing with metamaterials as this is just a basic intro to EM waves, and thus the video has it wrong.
But that's not really the point. The point is to explain the concept behind it. I didn't understand it at all but now I am beginning to make some sense of this.
Actually, the direction IS important. The wave would NOT travel to the right, but to the left. (E, B, k) should be positively oriented in a sense that E x B is in the k-direction (k being the wave vector). Andrew Yang is completely right, and you can't just rotate/shift to make it right...
I have some small question. Just a few videos back we learned that magnetic field is technically infinite and has to loop. However here we have boundaries like Amplitude. How do we interpret it? Is it also technically a loop and lines do extend infinitely but we just don't draw them because strength of a field diminishes rapidly or what?
excellent layout demo's thank you. I hear a lot of chit chat about the 7.83 Schumaans Resonance Brain frequency (aka Earths pulse) and this 440hz is chaos frequency and the 528hz is the Miracle frequency...can you share a video on these subjects..really enjoy your style of teaching. Cheers
wawes what ever they are, have same principals. the type of the wave(s) that are crossing determines outcome. Bouncing on different surfaces is where the fun starts :)
Electromagnetic waves can propagate through a medium or through vacuum. They are not like mechanical waves, like sound or waves in the water, that do need a medium (ie, air and water respectively) to propagate.
Smash electromagnetic waves with sounds waves with a physical matter (metal) with accelerated electrons controlled waves length and power an open point like a hole will be allow a physical metal object to travel to any point in time
Why does the changing magnetic and/or electric field move outwards? I can understand that they interact, but you have completely failed in explaining how they move.
+Mouka Faslouka Good question, I'm not entirely sure that I know what I am talking about here, but if I understand properly an EM wave is actually a disturbance in the EM field. It's this disturbance that we describe as a wave, and it propagates outwards forever or until it is absorbed. It moves because it has to move, it is intrinsic to it's natural phenomena and the laws of nature itself. Imagine the waves in the ocean, if there were no friction and this example took place in a vacuum, then when the waves of the ocean move they would move on forever as the forces emitted and absorbed would perfectly create perpetual motion. It is like this that an EM wave moves along the EM field. However, here on earth there is much noise and so em waves dissipate at a much higher rate. When an EM wave travels through some other medium it excites the atoms in whatever mass it was consumed by, vibrating the electrons to the same frequency it was consumed at and releasing a new em wave of it's own, which in turn moves to the next atom, and the cycle repeats.
And also there are some more things which always baffles me about EM waves: 1. Does EM wave exist only in this point which he shows at 3:22 ? or in the entire space between that point and the end of the arrow? I mean can that field be experienced all along that field vector line or just that point? 2.Suppose I place a small magnet along the line vector of any one of the field, will it deflect? I mean in a point between the point at 3:22 and the end of the arrow I place a tiny magnet. 3.Consider only visible light. Suppose the amplitude of this field is tooooo much, will a tiny magnet kept 5mts away be deflected too if the amplitude extends 5mts ? I mean a light traveling parallely to me should be visible to me if it has higher enough amplitude to make it to me. 4. Will vibrating a permanant bar magnet also create a EM wave? If so, what about accelerating a magnet? Now I do know that the E and M field of an actual EM wave is so weak that there actually is no magnet other than proton n electron (I'm hoping) that can get deflected. But I am just talking about a virtual magnet here in order understand.
From what I understand light itself is an electromagnetic wave. It is radiation or energy oscillating at a frequency that our eyes can perceive. It is the same as inferred and microwaves or even fm and am radio waves. But those are at frequencies too high too see. It’s also the same as uv and x rays but those waves are too low to see. But as far as why does a wall that’s painted blue emit electromagnetic radiation at a frequency that we perceive as blue I have no clue.
Marcus Tullius Cicero ok so upon further research color comes from an objects ability to absorb specific frequencies of light. Idk the deeper I look into the whole thing the more my head hurts tbh. Like the relationship between color light energy frequencies radiation radio waves and which can exist without which and how they all effect each other or the fact that we can even see anything it’s too existential for me to handle.
Both are quite different things, a charging capacitor have a changing electric field in between plates but doesn't have current there. Maxwell just named that as displacement current, just named.
Yu Chiu most likely the lack of a phase angle in the constituent waves of light is due to the fact that photons do not experience time since they move at the speed of light. In electric circuits, these phases happen as a result of how differential components like capacitors and inductors interact with electrons which have mass and cannot instantaneously equalize their positional energy while moving around in a circuit
***** I'm pretty sure you can't create magnetism with electromagnetic waves, but you can ionize particles and give them charges and if these charged particles are moving, they will generate a magnetic field. As for 'transferring electricity", no, you can't do that with electromagnetic waves either. What you can do, again, is ionize particles by stripping their electrons from them and letting these components move around. That's essentially how fluorescent light works; you have gases in the glass chamber of the light, you run a current through the gas, rip out their electrons and turn that gas into an ionized form of gas, aka plasma, which emits energy and light because the electrons are moving around from atom to atom. In sum, the only thing electromagnetic waves transfer is energy, because electromagnetic waves *are* energy in motion, going at the speed of light, which is just a constant for *any* kind of electromagnetic wave, not just the ones in visible light. Hope I didn't confuse you.
LeoM You can transfer electricity - that is how radio works! The transmitter induces small currents into the receiving aerial. Crystal sets are powered entirely from this current and need no other power source!
ZigSputnik The person who asked meant if you could transfer electricity through light; although fiber optic cables might do that, I'm not sure. But what you described is inducing electricity, not exactly transferring it.
LeoM Yes, I did appreciate that, but the word 'transferring' is valid here even if there is a conversion process at each end. After all, what is a battery if not a means by which electricity can be stored and transferred? I was just concerned that you may have given the impression that the electromagnetic wave could not be used for this purpose.
What's with the frequency and the wavelength being inversions of each other? 750nm & 4x10^14Hz VS. 400nm & 7.5x10^14Hz. Why is this? How does this work?
Charles Karter Imagine lines drawn across a road. If you were driving 60km/h, and there was 100m between each line (length), you would drive over a line every six seconds (frequency). Going the same speed, if you were to increase the length between the lines to 200m, you would then pass one only every 3 seconds, meaning the frequency of the lines would decrease as the length increases. Thus, when you increase the waveLENGTH of a wave (distance between the crests of the wave), you decrease the frequency.
Is all eletromagnetic wave originated by a charge or a field oscilating somewhere? And every charge oscilationg in the universe send energy (create photons) in a direction?
I'm a little confused. If electric and magnetic fields are two sides of the same coin and represented as a kind of perpendicular wave, how come most light is represented as a single wave? Are the two combined to come up with a single wave?
so can you tell what is the maximum frequency we can use on cell phones? I know their use can disrupt our brain function, because it meses with neuron transmission
halconsalvaje They transmit radio waves and light... Light can't break through the skin, radio waves can but when radio waves are absorbed by your skin they can't escape, so infrared is produced and held in your cell or your head. Not really dangerous at all. You absorb more radiation whilst being with another human than having a phone against your head.
So the photon is like a bundle of energy that travels through space at 300,000 km/s that has oscillating magnetic and electric fields which are at right angles to each other and both perpendicular to the direction of propagation and the more energy the photon has the faster its magnetic and electric fields oscillate, right? So is the magnetic field like the one around earth but its constantly switching its poles up and down? And I don't quite get what an electric field is. Can anyone explain? - Trying to understand Yr 9 physics class.
![Blox Fruits Dragon Rework Update [Full Stream]](http://i.ytimg.com/vi/EqDAp8udhm0/mqdefault.jpg)
you explained this concept better in a 12min video than my 2 hour of lessons from my own teacher, thanks
Ong
so, are our eyes just antennas that are tuned to visible light frequencies?
more likely, the entire human body is a receiver
no, there are molecules in each cell which react to different frequencies
Pretty sure the cones are shaped like antennae
More of a photochemical receiver than an electromagnetic reciever
Well, in some ways I would say “yes” but also “no”. Do you know what I mean?
Khan Academy is incredible. It is astonishing. It is without words. Thanks.
You are the best physics tutor on Khan!! I was so relieved to hear you teaching once I turned on the video!
Came here for answers to my hw, but even after knowing them i stay cuz its so well explained and interesting. Well done
In the example of the electromagnetic wave with perpendicular E and B fields, you say the wave propagates to the right. Based on the way you drew it, that's not actually the case. E cross B gives the direction of velocity and so in your example the wave propagates to the left (negative x direction).
yes.. correct
Instead of criticizing and correcting which is easy and anyone can do, why don’t you make a better video? This young man has made an effort to explain electromagnetic waves and help improve everyone else. Try to do the same instead of finding fault please. It’s much harder to create things, but it will make you proud of yourself in the end. I’m sure you can do it.
@@AbdelJimenez he just showed the mistake and I am very thankful
Chemgeek16 is right. but Abdel Jimenez, he just shows a mistake in the video, he is NOT criticizing.
best video ... finally i got the electromagnetic waves :D
hows 11th grade?
very informative! thanks for the share
Wow, finally got it! This video does a great job explaining this!
I believe that X coordinate @3:55 should be a time coordinate if this graph is to show self-propagation. Using a distance coordinate creates a graph showing the two fields frozen in time, and therefore shows the oscillation of the producing charge instead.
this playlist has helped me through my A levels physics. how universal knowledge is!
Yes I agree as well. The E and B fields are backwards. The right hand rule states if you start your right hands fingers in the E direction and CURL to the magnetic field, your thumb will naturally point in the direction of propagation. The YELLOW should be Electric Field. The RED should be Magnetic field. Great video though!
Also where one field is changing at max rate (crossing zero) the orthogonal field should be at max amplitude...the picture is wrong. Electric and magnetic fields never cross at zero together, one field should be (phase) shifted by a quarter cycle in the drawing.
@@gruviboy Are you sure? All drawings show the 2 fields in phase as they propagate.
I know I'm commenting on a 9 yr old video but it's got to be said - thank you so much! I was looking for the resource that could reconcile my understanding of electromagnetism in wires and magnets and electromagnetism when speaking about light and radio waves. And here it was posted nearly a decade earlier, a little over 10 minutes long. You absolutely smashed it. Thanks again.
That Hulk Reference Doe.
Your video is genious
Really helped me and have me a bigger interest in the electromagnetic spectrum
Splendid. Easy to understand. Thank you
THE LUNATIC FRIDGE IS NOW ALSO ON EDUCATIONAL VIDEOS.
I HAVE TO STUDY TOO, Y'KNOW?
Salman amigo : intercambia la rotulacion de E y B en las graficas para que la direccion de la propagacion cumpla la regla de la mano derecha. Saludos desde Honduras y apreciamos este gran esfuerzo y proyecto de transmitir conocimientos a la humanidad!
Very helpful! Thank you!
I think the wave direction should be the opposite direction, when using right-hand rule, the finger tips conserving from E to B, the thumb shows the wave direction, which is left
i agree
Nice video! Extremely pragmatic approach!
Best ever !
Without any confusion and ambiguity.
Sir please arrange these lectures of e.m waves in your playlist
Then it can help more
Great lesson! Very fundamental informations! Thank you!
Very great explanation - thanks!
One of the best video I have ever seen. Thank you for this
Thank you from Texas
easy to understand thanks
This video has really helped me, thank you.
Thank you so much. You have explained it well...
epic video !! great job :P please do more this is very well explained and interesting!
This was really helpful thank you❤
Can a rapidly magnetic field create light? Would be interesting
6:08 what determines that frequency, how do you get that magnetic field to oscillate quicker?
Wish I could like a thousand times...sooo effective👍
You have nailed it 👍
Great video! Thanks
MMM, to see if i understood. EM Wave is the way how energy tralves through vacuum. While increse the velocity of wave the length decrease.
So WiFi wave wave transport energy(On/Off) when is up 1 or 0 is down?
Today AM is used more for UHF radiosignals and FM in the VHF area. Due to the fact that frequency modulation becomes tricky with higher frequencies. Opposite to what you said.
THANKS MAN!!!
This guy is my fav on all of Khan academy.
very useful video!
Gotta a test tomorrow hihihi thank you very much sir!
Thank you for explaining it.
Can someone give me some trivia about EM Waves? Pleaseee. I need it for tommorow 🙏
great explanation
Visible=visible to normal human eye. All ranges are visually visible. My brother can clearly see infrared in day light, had tested him many times by various types of IR remote controls even with dead batteries. EM waves travelling through the empty space without media is quantum physics.
Great. Thx
You’re incredible
I’m just 13 and I love all this! Damn!
im 9 lool
@Henry HUNG [07N15M] and here is my 3 yr old sis watchin this with me and asking me questions like what is electromagnetic??? and oh the way she is pronouncing it is way too funny
man you are good
EM wave as drawn is propagating in the wrong direction! Please fix!
+Andrew Yang That doesn't matter. Light can be polarized in any direction. Up down left and right are completely relative. As long as the fields are perpendicular there is nothing wrong with what he drew. For example if you rotated the light and shifted it back by one period it would look exactly like what you described or might see in a textbook.
+Wilfredo1242 Well in general, if the wave is propagating in a normal medium, the direction of wave propagation is always in the E X H direction, which means the video has it wrong. We aren't dealing with metamaterials as this is just a basic intro to EM waves, and thus the video has it wrong.
But that's not really the point. The point is to explain the concept behind it. I didn't understand it at all but now I am beginning to make some sense of this.
Actually, the direction IS important. The wave would NOT travel to the right, but to the left. (E, B, k) should be positively oriented in a sense that E x B is in the k-direction (k being the wave vector). Andrew Yang is completely right, and you can't just rotate/shift to make it right...
Actually, he used it only for representative purpose. He was not explaining the direction.
"Gamma rays won't turn people into superheroes but it's very energetic"
My disappointment is immeasurable and my day is ruined
How are schisms of intelligence supposed to interact with each other?
I have some small question. Just a few videos back we learned that magnetic field is technically infinite and has to loop. However here we have boundaries like Amplitude. How do we interpret it? Is it also technically a loop and lines do extend infinitely but we just don't draw them because strength of a field diminishes rapidly or what?
Istg i'm gonna get my degree thanks to you.
excellent layout demo's thank you.
I hear a lot of chit chat about the 7.83 Schumaans Resonance Brain frequency (aka Earths pulse) and this 440hz is chaos frequency and the 528hz is the Miracle frequency...can you share a video on these subjects..really enjoy your style of teaching. Cheers
Nice Video
Thanks!!
Awesome
you are so good
Clearly! I have never believed that the waves are in 2 dimensions. But OK, I will do from now on.
Do these waves have something to do with their source voltages?
is it B in z axis right and E is in Y?
so does light have both a positive and negative charge? therefore allowing an electrical field?
THANK YOU
This is like 100x more useful than my textbook. Thanks! (And I'm from Finland, which is considered "high standard" in education. Bullshit imo.)
Yours Grade ?
@@AimzIIT upper secondary, ages 16-18 yr
Can the Mandelbrot set define electromagnetic waves?
wawes what ever they are, have same principals. the type of the wave(s) that are crossing determines outcome. Bouncing on different surfaces is where the fun starts :)
This is one of the bst channels i have ever seen. This is the only channel made me better in my physics!!
Do all these wave lengths have constant voltages?(I mean constant peak voltages of the electro magnetic wave)
What is the'' ocean'' for electromagetic waves? what is their medium? they run on what? Black water?
Electromagnetic waves can propagate through a medium or through vacuum. They are not like mechanical waves, like sound or waves in the water, that do need a medium (ie, air and water respectively) to propagate.
Smash electromagnetic waves with sounds waves with a physical matter (metal) with accelerated electrons controlled waves length and power an open point like a hole will be allow a physical metal object to travel to any point in time
can you imagine that i did read your post twice? Before realizing that u nigga are high
How does 90 degrees point into screen and point out of the screen?
Electromagnetic waves is used for remote neural monitoring and mindcontrol these days through the application of RADAR
Why does the changing magnetic and/or electric field move outwards? I can understand that they interact, but you have completely failed in explaining how they move.
+Mouka Faslouka Good question, I'm not entirely sure that I know what I am talking about here, but if I understand properly an EM wave is actually a disturbance in the EM field. It's this disturbance that we describe as a wave, and it propagates outwards forever or until it is absorbed. It moves because it has to move, it is intrinsic to it's natural phenomena and the laws of nature itself. Imagine the waves in the ocean, if there were no friction and this example took place in a vacuum, then when the waves of the ocean move they would move on forever as the forces emitted and absorbed would perfectly create perpetual motion. It is like this that an EM wave moves along the EM field. However, here on earth there is much noise and so em waves dissipate at a much higher rate. When an EM wave travels through some other medium it excites the atoms in whatever mass it was consumed by, vibrating the electrons to the same frequency it was consumed at and releasing a new em wave of it's own, which in turn moves to the next atom, and the cycle repeats.
And also there are some more things which always baffles me about EM waves:
1. Does EM wave exist only in this point which he shows at 3:22 ? or in the entire space between that point and the end of the arrow? I mean can that field be experienced all along that field vector line or just that point?
2.Suppose I place a small magnet along the line vector of any one of the field, will it deflect? I mean in a point between the point at 3:22 and the end of the arrow I place a tiny magnet.
3.Consider only visible light. Suppose the amplitude of this field is tooooo much, will a tiny magnet kept 5mts away be deflected too if the amplitude extends 5mts ? I mean a light traveling parallely to me should be visible to me if it has higher enough amplitude to make it to me.
4. Will vibrating a permanant bar magnet also create a EM wave? If so, what about accelerating a magnet?
Now I do know that the E and M field of an actual EM wave is so weak that there actually is no magnet other than proton n electron (I'm hoping) that can get deflected. But I am just talking about a virtual magnet here in order understand.
How can i shield myself from "Voice to Skull" technology & remote neural weapons?
that name tho
They (the fields) do not create each other. They are both caused by charge density and current density.
Is there an EM field where the red and yellow line cross each other?
What does light have to do with magnetic and electrical fields though? Where does the connection come from??
From what I understand light itself is an electromagnetic wave. It is radiation or energy oscillating at a frequency that our eyes can perceive. It is the same as inferred and microwaves or even fm and am radio waves. But those are at frequencies too high too see. It’s also the same as uv and x rays but those waves are too low to see. But as far as why does a wall that’s painted blue emit electromagnetic radiation at a frequency that we perceive as blue I have no clue.
Marcus Tullius Cicero ok so upon further research color comes from an objects ability to absorb specific frequencies of light. Idk the deeper I look into the whole thing the more my head hurts tbh. Like the relationship between color light energy frequencies radiation radio waves and which can exist without which and how they all effect each other or the fact that we can even see anything it’s too existential for me to handle.
Lol. "It didn't require a current, it just required a changing electric field." Those two are the same mate.
Both are quite different things, a charging capacitor have a changing electric field in between plates but doesn't have current there. Maxwell just named that as displacement current, just named.
You forgot to include the lengths of other regions of EM spectrum
In EM wave, I see the same phase angle for E and B field. But why in electric circuit there is always phase angle between voltage and current.
Yu Chiu most likely the lack of a phase angle in the constituent waves of light is due to the fact that photons do not experience time since they move at the speed of light. In electric circuits, these phases happen as a result of how differential components like capacitors and inductors interact with electrons which have mass and cannot instantaneously equalize their positional energy while moving around in a circuit
So hulk is one of those heroes that are exposed in gamma rays 😆
since light is electromagnetic, can we create a magnetic with light, or transfer electricity through light?
***** I'm pretty sure you can't create magnetism with electromagnetic waves, but you can ionize particles and give them charges and if these charged particles are moving, they will generate a magnetic field. As for 'transferring electricity", no, you can't do that with electromagnetic waves either. What you can do, again, is ionize particles by stripping their electrons from them and letting these components move around. That's essentially how fluorescent light works; you have gases in the glass chamber of the light, you run a current through the gas, rip out their electrons and turn that gas into an ionized form of gas, aka plasma, which emits energy and light because the electrons are moving around from atom to atom. In sum, the only thing electromagnetic waves transfer is energy, because electromagnetic waves *are* energy in motion, going at the speed of light, which is just a constant for *any* kind of electromagnetic wave, not just the ones in visible light. Hope I didn't confuse you.
LeoM
right on thanks
LeoM You can transfer electricity - that is how radio works! The transmitter induces small currents into the receiving aerial. Crystal sets are powered entirely from this current and need no other power source!
ZigSputnik The person who asked meant if you could transfer electricity through light; although fiber optic cables might do that, I'm not sure. But what you described is inducing electricity, not exactly transferring it.
LeoM Yes, I did appreciate that, but the word 'transferring' is valid here even if there is a conversion process at each end. After all, what is a battery if not a means by which electricity can be stored and transferred? I was just concerned that you may have given the impression that the electromagnetic wave could not be used for this purpose.
6:00 or so we all know the wavelength is 1.5 right
So the magnetic field is the sine of x?
ExB should be in the direction of V.
could an aquifer work in any way with this?
yes
What's with the frequency and the wavelength being inversions of each other? 750nm & 4x10^14Hz VS. 400nm & 7.5x10^14Hz. Why is this? How does this work?
Keep in mind that C = (wavelength)(frequency). This means that Frequency and wavelength are inversely proportional to one another.
Charles Karter Imagine lines drawn across a road. If you were driving 60km/h, and there was 100m between each line (length), you would drive over a line every six seconds (frequency). Going the same speed, if you were to increase the length between the lines to 200m, you would then pass one only every 3 seconds, meaning the frequency of the lines would decrease as the length increases. Thus, when you increase the waveLENGTH of a wave (distance between the crests of the wave), you decrease the frequency.
Is all eletromagnetic wave originated by a charge or a field oscilating somewhere? And every charge oscilationg in the universe send energy (create photons) in a direction?
I'm a little confused. If electric and magnetic fields are two sides of the same coin and represented as a kind of perpendicular wave, how come most light is represented as a single wave? Are the two combined to come up with a single wave?
but what are the waves made from if not particles?
This is so much better when you're high
so can you tell what is the maximum frequency we can use on cell phones? I know their use can disrupt our brain function, because it meses with neuron transmission
halconsalvaje They transmit radio waves and light... Light can't break through the skin, radio waves can but when radio waves are absorbed by your skin they can't escape, so infrared is produced and held in your cell or your head. Not really dangerous at all. You absorb more radiation whilst being with another human than having a phone against your head.
Radio waves of less energy passes through opaque substances then why not the visible light waves of higher energy pass through the same?
🤯🤯🤯
AM and FM are types of modulation, not higher or lower frequencies ??!!
So the photon is like a bundle of energy that travels through space at 300,000 km/s that has oscillating magnetic and electric fields which are at right angles to each other and both perpendicular to the direction of propagation and the more energy the photon has the faster its magnetic and electric fields oscillate, right? So is the magnetic field like the one around earth but its constantly switching its poles up and down? And I don't quite get what an electric field is. Can anyone explain? - Trying to understand Yr 9 physics class.