Cathode Ray Tube Experiment and Charge To Mass Ratio of an Electron
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- Опубликовано: 2 фев 2020
- This chemistry and physics video tutorial provides a basic introduction into the cathode ray tube experiment. JJ Thompson used this experiment to conclude that all atoms contain negatively charged particles known as electrons. Using this experiment, he was able to calculate the charge to mass ratio of an electron.
Chemistry - Basic Introduction:
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Scientific Notation Review:
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Significant Figures Review:
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Unit Conversion Problems:
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Density Practice Problems:
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Pure Substances & Mixtures:
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Law of Conservation of Mass:
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Law of Definite Proportions:
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Law of Multiple Proportions:
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Rutherford's Gold Foil Experiment:
• Rutherford's Gold Foil...
Cathode Ray Tube Experiment:
• Cathode Ray Tube Exper...
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Atoms - Basic Introduction:
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Cations and Anions Explained:
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3 boring hours of brain-melt from my teacher, condensed into 18 interesting minutes of knowledge.
Thank you so much.
I wish to meet u one day brother...
Mee toooooooooo
Please forgive him bro
This sounds like a threat
@@varunsathya1912 note he called him a brother
I am him😂
Why is this so simple when you are explaning it man omg like every one of your videos like that i love youuuu
Brother you helped me immensely with this. I was so troubled, my textbook showed the e/m value without even a hint about how it came to be.
dude what a coincidence I took this today at school
and I didn't understand anything
but now it looks easy for me
thank you so much
Saame!
I got online class about this last week and tbh i don't even remember a thing
Thanks for giving such clear explanations on the calcus !
Finally, a video that gives a complete explanation of this experiment! Thanks.
Professor Organic Chemistry Tutor, thank you for a solid analysis of the classical Cathode Ray Tube Experiment and the Charge to Mass Ratio of an Electron in AP/General Chemistry. The Cathode Ray Tube Experiment is a well-known experiment in Science and Engineering. This is error free video/lecture on RUclips TV with the Organic Chemistry Tutor.
my chem teacher explained this to me for a whole 75 minutes class and I didn't understand anything. You explained it in just a few minutes and I finally got it, you are my chem savior!!
Wait which country are you from? Because in our country this is under physics subject
You made me actually love science I am so grateful
I love you so much, I do not know what I would do without you😭
This has been so helpful thank you!!!!!
This guy has a video on EVERYTHING Physics and Chemistry
Please make a video on how to follow your videos to complete organic chemistry topic wise.
Thank you for your clarification. This has unlocked my brain from freezing.
nice video its help me alot on chemistry :)
Thank you very much, this video really helped me for facing my exam
At least ! The best video about the kathod ray experiment !
The author is awsome !!!
I learned from my professor how to use right hand rule to find the direction of F, B, and v. I struggled a while as you arranged y and x arises differently. Finally I realized that what I learned is still right.
Tysm u r such a good teacher u r doing an awesome job
Good explanation.....my teacher doesn't know how to teach......thank you for your service....may good things come to you....bless you
I must confess that this video is loaded 💯👏👏
It's so good and specially in simple words, I am a Physics student and I'm learning it for my Modern Physics part
Thank you so much!!
Master you're amazing, you're a God sent
Excellent demonstration. what happens if positive and negative terminals of the battery were swapped?
for some reason, ur voice is healing
kinda upset that this was posted after my exam :(
This is completely awesome. thanks ❤uuuuu
Thank you so much you are the best
Good job 👏
Nice video❤️. Can you please make a video for the oil drop experiment
Very good thank you
I can only say: “thank you”.
Thank you !
You’re a hero 😍❤️❤️❤️
the electron source was metal plates or ionisation of gas taken in the tube?
JJ THOMPSON
Could you please explain CRO cathode Ray oscilloscope....it would be really helpful ..thanks
thank you!!!
Page 5:00 I didn’t notice that the experiment test with insulation materials other than various metals, how can we conclude all materials possess and can emits electrons?
Thank you 😭
Nice video and presentation.
Page 3:40 acknowledging that charge plate affect the beam from moving straight. But wouldn’t the glass tube wall blocks electric field of the plate? If not why not?
Does this mean that also using this experiment, one could conclude which is the positive and negative side of a magnet?
Thanks for teaching me what my teachers in egypt failed to.
respect JJ Thomson
i have question In cathode ray experiment there was used an electric field, so how was it determined which metal is + or - charged if the charge is determined by electrons and it wasn't yet discovered same goes with the voltage before discovring elctrons how was it determined which + or -
Thank you
i want to ask something. is this experiment electrolytic or galvanic cell? sorry, if I ask a dumb question.
At 7:07 shouldnt the magnetic force exerted on the electron be downwards instead of upwards? Using RHR, taking your thumb to the right and your fingers outwards( toward you) , the palm of your hand will be facing downwards( the magnetic force).
In ncert text deflection of electron in the presence of B is given just opposite?
????
16:56
Why is the electron moving in the upward direction considering the force for negative charge is downward.
Shouldn't it move in a circle in the downward?
Or I missed smth?
I too have this question.
My answer gets deleted, so I'll try once more in next comment
He applies the material once the electric and magnetic force are balanced. Then the electron are affected by the magnetic force, and (I think) CIRCLES starting downward. But maybe the circle-motion, being perpendicular, have nothing to do with the curve going up, so I think the magnetic force, the only force left, attracts the electron to the north plate that might be a positively-charged material.
How do we calculate radius of curvature?
Life saver
U teach better than my irl teacher
*than all of the viewers, otherwise, we wouldn’t be here! :)
why did he use right hand rule, he was supposed to use left hand rule for getting the direction of the force. Right hand is used for the direction of induced current, innit?
Thanks man but how do you cAlculate magnetic force
Magnetic force = charge* cross product of velocity and magnetic field
Cathode rays tube are a stream of negatively charged particles (corpuscles) later know as electrons how does it happen.
How is it that the since the magnetic force provides the centripetal force, it's equal?
because the magnetic force is a centripetal force i.e. the centripetal force on its own is not a force(centripetal force is not a part of four fundamental forces it is a category fo forces which acts in a circular way)
@@vikrantsingh4504 +1
Because the magnetic force IS the centripetal force. Basically the magnetic force causes the centripetal. Therefore it’s equal. Remember that “centripetal force “ is basically explaining what the original force is doing So if the original force is the magnet Therefore, the centripetal would have same value .
In14.38 thumb should be at left as we take current on opp direction. To flow of electron
This rule is for moving particles in magnetic field. Your thumb points in the direction of the moving particle regardless of charge. Just remember when you do this with a positive charge the force comes out of your palm but withe a negative charge it comes out the back of your hand.
Yup youre right..
God richly bless you. Wish to meet you one day.
So two questions I can't seem to get an answer to.
Firstly, how was he able to realise which plate is positively and which was negatively charged since those values until deeper levels (quantum physics) are purely arbitrary.
Secondly, since the direction of the magnetic field does not change direction how does the electron move in a circle? What am I not understanding here? It is clear to me that velocity changes direction so the x product of v and B will have a different value. And intuitively as well, shouldnt the ray be deflected until its velocity is only towards the z axis? How does the magnetic force keep it's centripetal character even though the magnetic field is uniform in a single direction?
Did you get an answer to your questions?
yes im so confused about the whole anode cathode thing
One thing he glosses over is that the equation is actually F=qv x B. The magnetic field produces a Lorentz force that is perpendicular to both the velocity vector and the magnetic field. It only reduces to qvB when the cross product is 1 (angle is 90 degrees so sin(theta)=1, and B field is perpendicular to velocity). As the particle changes direction the uniform magnetic field is still constantly producing a force perpendicular to the velocity vector. In this case it's the same concept as centripetal force. For circular motion with uniform velocity the force is perpendicular and toward the center of the circle. So I guess for the second question, yes the magnetic field is not changing direction, but the force is because the particle is changing direction and this is built in to the equation with the cross product.
I see what you are saying now, as you already mentioned the cross product. For it to make sense you really have to visualize this in 3 dimensions. Otherwise, you might come to the conclusion that deflection would stop at a certain point. The particle is never moving in the same direction as the magnetic field since they are in completely different planes.
Hey dude how does r^2=q/m
I dont understand why Fm can make cathode ray opposite Fe?
I want to meet you in person you have the answers to all my problems I wish I could give you something
What about the grid system
If U mean about Grid as a third electrode that carries the duty of handle the electron stream, there is no a single word about. But you can apply superposition principle to figure out the effect it has on the stream
If there is more pressure in the tube I theorise it would be fine because electrons are subatomic particles they can pass through gas particles in the tube
No bro , the reason why pressure is this low is that there can't be any other gas particles left otherwise u won't any fine beam emanating from cathode . Moreover, any subatomic particle can't just pass through another atom whether they are matter-particle fermions or force-carriers bosons .
According to the right hand rule, shouldn't the force at 8:26 be directed downward? Is it opposite because the electron has a negative charge?
Nvm, I looked in my physics book, and it is indeed flipped because of the negative charge.
@@ajricherson1099explain plzzzz
I don’t know why in the world are people using right hand thumb rule for this we would not apply RHR because it gives the direction in which the particle would deviate due to electric field but we need to find the direction of deviation due to magnetic field for a moving charge so we will use the LHR
Why cathod ray not collide with the anode???
Anode tube had a hole in it
It’s perforated
Super
-NOTE-1
How did jj Thomson know that the ray consist from negative charge? 4:23
1)Due to the fact that it was deflect towards the positively charged plate
2)the fact that all different materials can emit a cathode ray helped him conclude that all atoms(materials) contain negatively charade particles
-NOTE-2
Q= why is the ray green glow ?
Bc the chamber is coated with a phosphor materials known as zinc-sulfide so when the electrons strike the glass they creat this characteristic green glow
-NOTE-3
Describe the experiment
Inside an evacuated chamber
The prussue is very very low
Also we have cathode (negativly chared electrod) and Anod (positivly chard electrod)
Next
When the caothod is heated by any heating element
And if there a high voltage applied between c and a
An electron beam is going to emanate (from the c towards the a and the a accelerate the ray towards the right)
Why is the trajectory a circle and not a parabola ?
Bc the (magnetic) force is perpendicular to the electron's velocity (right hand rule). I'm guessing your confused bc idk for example if you throw a ball (constant grav force) its trajectory is parabolic, thing is tho, if you were to yeet a ball fast enough that 1 the gravitational force is perpendicular to its motion and 2 it stays perpendicular to its motion, it would also be a circular trajectory.
(I think)
@@williamscott1516thank you for the explaining. It was actually very clear !
About how much I love u ❤
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See another
This is why Tesla never got his death ray built. I guarantee it has something to do with getting the death built, just saying I was the first to say the cathode ray / Death Ray.....might have had some technical similar condition
What exactly is an electrode?
U dumb
@@Vedant.Dhawan 😒😒
@@kasra38s what?
@@Vedant.Dhawan don’t be toxic
He lost me when he started talking abt Physics
You mean when the video started?
you sound like mark wahlberg
Mass of electron should be 9.11*10^-31kg
He converted the mass of an electron to grams which is correct.
I see
dope
Excuse me professor may I go to the comfort room?
How many subs dies he was ?
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use better grafix
Class 11th students 😢
6:51 I've been struggling with the directions of the magnetic field, magnetic force, and velocity of the charge for two weeks and it turns out that I was using the direction of velocity of a positive charge while studying about ELECTRONS😐🥲