On Paper 1 on the advanced information for OCR, it mentions • Astrophysics & Cosmology (includes practical skills). Could the practical skills be on the diffraction grating experiment?
Just speculation but it could be a variation of this experiment, it could also be something not as standard like a Hubble's Law simulation with a balloon or a parallax observation or a doppler shift absorption spectra question. We need to be prepared for all! : )
I have a question: At 15:20 the wavelength turned out to be 1400 nm, this is obviously not visible light. It is either infrared or short wave microwave radiation. Is this valid? How would this "fringe" be detected?
Method is the same regardless of wavelength, for microwaves you would just use a microwave detector, you often get exam questions relying on that actually. Excellent question!
Fantastic! You can definitely understand a lot of the stuff in the video and in astrophysics as a lot of is algebra based: ) drop me a comment if something doesn't make sense. You can do it! : )
so the temperature increases going back to the origin (to the left), i.e. blue giants have a higher temperature which corresponds to a lower wavelength (blue). Hope this helps!
Hello sir, quick question Do we use the modulus of the change in energy for 8.58 as the change in energy would be negative, thanks a million these videos are so useful
There is no standard convention sadly for this, but the modulus will gave the correct value each time and would also get rid of any problems which would not make sense - e.g. negative frequency/wavelength. Thanks for the kind words!
Hi z physics , after a year and couple months of a level physics Ocr a I’ve noticed that ocr papers comprise of content (like written explanations, relationships , definitions etc) , equations (just picking the right one and sometimes rearranging) and then some maths (graphs, derive the equation, proofs). I’ve used your amazing videos to perfect the content and equation questions but I’m really struggling with the harder maths questions usually at the end of the papers. I don’t do a level maths. Do you have any videos on your channel/ question banks/ recommendations for the maths questions?
Hi! I've got a maths video here going over all the mathsy skills: ruclips.net/video/neBotgd2PKA/видео.html Hope this is helpful! I have also filmed almost all the past papers so hopefully this helps when you are going through past paper questions. Good luck! : )
Is it also possible to convert lines per mm using 1x10^-3 / 300 ? Your method is confusing me a little bit being used to using 10^-3 when i see the word milimetre lol.
Hi I am confused about the formation of stars in spec mentions electron degeneracy pressure, characteristics of black holes and white dwarfs as well as the processes of the formations, but the video doesn't really cover these in too much detail. Is there a reason for this as usually all of your videos cover exhaustively.
thank you so much! The mentioned characteristics typically score 1, maybe 2 marks and there isn't that much that seems to be examined on them. Have a look at the past papers to get a feel for what questions they ask. Hope this helps!
depends which exam board you are doing. If you are doing OCR A, diffraction gratings is assessed at A Level, not AS. Hope this helps! Other exam boards tend to assess diffraction gratings in AS but check wit h your exam board.
I was looking forward to this topic, but it's turning out to be the most challenging and confusing. It seems like it's just a bunch of memorization. When hearing all the terms used, I feel like there is prerequisite knowledge that I am missing, but that can't be the case as I've followed the textbook and learned all the preceding topics
So we measure x and D, x1 is the distance from the central fringe to to the n1 spot, x2 to the n2 spot etc, we measure them multiple times. Hope this helps!
Hi, Wien's displacement law, the peak wavelength of a body is inversely proportional to the temperature. Stefan's law: The total power radiated by a star is proportional to the area of the star multiplied by T^4.
Hello sir! I'm a bit confused in 11:37 - I thought that absorption spectrums were for stars in which the COOLER gases around them absorbed the emitted photons? I may be wrong though, but I hope you could clarify this for me. Thank you x
The cooler gases (it's actually ionised) is in the stars themselves acts as the gas which is absorbed. By cooler this is only compared to the core which is in terms of millions of degrees. The surface temperature is still of the order of thousands of degrees K.
@@tychophotiou6962 oh no, don't worry at all : ) I am always happy for feedback! I tried fixing it but sadly, the sound gets out of sync when I use the youtube editor. Thanks for letting me know and drop me a line if you spot something else! : )
@@abdulhadiyaseen1288 Hi, this is for all exam boards, you can check with your spec here: www.cambridgeinternational.org/Images/554625-2022-2024-syllabus.pdf (assuming you are doing the 2022 spec? You can check with your teacher)
Hi sir, I am a bit confuse about the chandrasekah limit. when we compare the mass of star with 1.4 times of the solar mass, are we using the mass of core of the star? Thank you
they need to be known but questions on these typically simply involve something such as "state other object in the solar system" or just ask you to calculate something such as the gravitational field strength of an object if you are given the mass/radius etc.
Hi, this is for all exam boards, you can check with your spec here: www.cambridgeinternational.org/Images/554625-2022-2024-syllabus.pdf (assuming you are doing the 2022 spec? You can check with your teacher)
I am serious! Check out gravitational singularities, there are actual mathematical infinities within black hole theory when dealing with them. To solve them we need to combine general relativty and quantum which has not been done and verified yet. Or modify both! : )
Hi guys! I have also filmed some past paper questions practice. Hopefully it is helpful! : )
ruclips.net/video/nuTdbYL8X0M/видео.html
Thank you, you're an absolute blessing! I have a feeling you're going to end up saving my entire grade right here
Thank you so much for the kind comment! Drop a comment if something doesn't make sense!
@@zhelyo_physics Thank you so much, really appreciate the offer! Keep up the incredible work
never understood this topic till now. thanks a lot sir!!!!!
anytime! comments such as these genuinely make my day!! Thanks!
night before OCR A 2022 paper 1, ZPhysics you're the goat man
Good luck tomorrow!! : ))
Im here a year later 😭
Haha today for me
On Paper 1 on the advanced information for OCR, it mentions • Astrophysics & Cosmology (includes practical skills). Could the practical skills be on the diffraction grating experiment?
Just speculation but it could be a variation of this experiment, it could also be something not as standard like a Hubble's Law simulation with a balloon or a parallax observation or a doppler shift absorption spectra question. We need to be prepared for all! : )
@@zhelyo_physics Hi could you do a video on the possible experiments for the astrophysics & cosmology practical skills. thanks :) your vids are great
I love this class, thanks,really helpful
Glad to hear!
2hrs to go I love this video!
Good luck!
I have a question:
At 15:20 the wavelength turned out to be 1400 nm, this is obviously not visible light. It is either infrared or short wave microwave radiation. Is this valid? How would this "fringe" be detected?
Method is the same regardless of wavelength, for microwaves you would just use a microwave detector, you often get exam questions relying on that actually. Excellent question!
I’m just 14 not even in college yet and I have a very good understanding of this kinda stuff I dream of becoming a astrophysicist
Fantastic! You can definitely understand a lot of the stuff in the video and in astrophysics as a lot of is algebra based: ) drop me a comment if something doesn't make sense. You can do it! : )
me too!!! :)))
Keep yourself safe😅
@@trueblaze8930LOL
im 17 doing alevels and u studying this gives a smile to my face
really useful for my astronomy gcse coming up!!
Good luck!
In 2:43, is the Hertzsprung Russel Diagram accurate? I think the positions of the red and blue supergiants should be exchanged
so the temperature increases going back to the origin (to the left), i.e. blue giants have a higher temperature which corresponds to a lower wavelength (blue). Hope this helps!
Hello sir, quick question Do we use the modulus of the change in energy for 8.58 as the change in energy would be negative, thanks a million these videos are so useful
There is no standard convention sadly for this, but the modulus will gave the correct value each time and would also get rid of any problems which would not make sense - e.g. negative frequency/wavelength. Thanks for the kind words!
Hi z physics , after a year and couple months of a level physics Ocr a I’ve noticed that ocr papers comprise of content (like written explanations, relationships , definitions etc) , equations (just picking the right one and sometimes rearranging) and then some maths (graphs, derive the equation, proofs). I’ve used your amazing videos to perfect the content and equation questions but I’m really struggling with the harder maths questions usually at the end of the papers. I don’t do a level maths. Do you have any videos on your channel/ question banks/ recommendations for the maths questions?
Hi! I've got a maths video here going over all the mathsy skills: ruclips.net/video/neBotgd2PKA/видео.html
Hope this is helpful! I have also filmed almost all the past papers so hopefully this helps when you are going through past paper questions. Good luck! : )
@@zhelyo_physics thanks a lot
Is it also possible to convert lines per mm using 1x10^-3 / 300 ? Your method is confusing me a little bit being used to using 10^-3 when i see the word milimetre lol.
yep! should give the same answer
i love you and your videos you are amazing
thank you very much!.. fabulous content
Glad to hear it's useful! Thanks!
Masterclass.
Glad it's useful!
Does this video hit all of the spec points for a level ocr A?
yes : ) I always recommending keeping the spec and using it as a check list though. Hope this helps!
is this video better than the shorter videos on this playlist to learn the content sir? or is it best I watch the shorter videos
Hard to say, I'd say start with this one and if it doesn't make sense check out the other ones.
alright thank you@@zhelyo_physics
Chandrasekhar*
day before exam here we go
good luck tomorrow!
Hi I am confused about the formation of stars in spec mentions electron degeneracy pressure, characteristics of black holes and white dwarfs as well as the processes of the formations, but the video doesn't really cover these in too much detail. Is there a reason for this as usually all of your videos cover exhaustively.
thank you so much! The mentioned characteristics typically score 1, maybe 2 marks and there isn't that much that seems to be examined on them. Have a look at the past papers to get a feel for what questions they ask. Hope this helps!
Is half this video as level too? (diffraction gratings) is it not a wave topic?
Thanks
depends which exam board you are doing. If you are doing OCR A, diffraction gratings is assessed at A Level, not AS. Hope this helps! Other exam boards tend to assess diffraction gratings in AS but check wit h your exam board.
@@zhelyo_physics Oh! am doing AS OCR A physics, it seems my teacher put it as an end of topic test question previously.
Thanks!
for the grating experiment, can we also plot a graph of sinx against n? because we are varying n right ?
that would also be fine with the inverse gradient
@@zhelyo_physics thank u!
Great vid, really helpful.
Glad it helped! : )
Hi, in this video the gravitational field section wasn't gone over. Is there a separate video on this section?
ruclips.net/video/aGgYTvC16hA/видео.htmlsi=d4aexcb9nVbOgxPU just here in a separate video. Good luck revising!
I was looking forward to this topic, but it's turning out to be the most challenging and confusing. It seems like it's just a bunch of memorization. When hearing all the terms used, I feel like there is prerequisite knowledge that I am missing, but that can't be the case as I've followed the textbook and learned all the preceding topics
Drop a comment on bits that are confusing and I will do my best to explain them further. You can do it!
Can you do the practicals needed for OCR P1 and P2
I have covered a huge amount of them here:
ruclips.net/video/qFgVrOVWdVY/видео.html I will be adding more to this playlist. Enjoy!
what are we measuring multiple times for the diffraction grating experiment?
As in what is x1 and x2? and how are we measuring them.
So we measure x and D, x1 is the distance from the central fringe to to the n1 spot, x2 to the n2 spot etc, we measure them multiple times. Hope this helps!
@@zhelyo_physics we measure them to find wavelength using the formula but for different n and theta to get average wavelenght later on?
Watching 2 hours before 2024 exam
Good luck!
Thank you so much:) your explanations are great!
Thanks a lot for the comment! Glad to hear and much appreciated
Watching 4 hours before 2023 exam
Good luck!
Hey how would you answer a question that says state stefans law or wien displacement law
Hi, Wien's displacement law, the peak wavelength of a body is inversely proportional to the temperature. Stefan's law: The total power radiated by a star is proportional to the area of the star multiplied by T^4.
Hello sir!
I'm a bit confused in 11:37 - I thought that absorption spectrums were for stars in which the COOLER gases around them absorbed the emitted photons? I may be wrong though, but I hope you could clarify this for me.
Thank you x
The cooler gases (it's actually ionised) is in the stars themselves acts as the gas which is absorbed. By cooler this is only compared to the core which is in terms of millions of degrees. The surface temperature is still of the order of thousands of degrees K.
@@zhelyo_physics Thank you, it makes sense now.
That was really interesting, Thank you ZPhysics.
Anytime! Glad to hear! : )
I’m sure you must have noticed that there is a glitch in your video at 23:40
Yep! Hope it's useful nevertheless : )
@@zhelyo_physics extremely useful! Sorry if it seemed like a criticism. (I just thought you might want the feedback to sort it out)
@@tychophotiou6962 oh no, don't worry at all : ) I am always happy for feedback! I tried fixing it but sadly, the sound gets out of sync when I use the youtube editor. Thanks for letting me know and drop me a line if you spot something else! : )
hi. umm does this work for CIE A2 Level Physics as well? We just did our first class on this today and i cant really confirm if it does
Hi just check which bits are the same in your spec online: )
@@zhelyo_physics isnt this for 9702 CIE A-Levels!?!?!?
@@abdulhadiyaseen1288 Hi, this is for all exam boards, you can check with your spec here: www.cambridgeinternational.org/Images/554625-2022-2024-syllabus.pdf (assuming you are doing the 2022 spec? You can check with your teacher)
Hi sir, I am a bit confuse about the chandrasekah limit. when we compare the mass of star with 1.4 times of the solar mass, are we using the mass of core of the star? Thank you
Hi, this is the overall mass, as this is responsible for the total gravitation trying to crush it into a white dwarf when fusion runs out.
what about the terms like planet comet
they need to be known but questions on these typically simply involve something such as "state other object in the solar system" or just ask you to calculate something such as the gravitational field strength of an object if you are given the mass/radius etc.
nice
This is for A2, 9702 Physics, r8?
Hi, this is for all exam boards, you can check with your spec here: www.cambridgeinternational.org/Images/554625-2022-2024-syllabus.pdf (assuming you are doing the 2022 spec? You can check with your teacher)
"black holes have infinite density 1 " cmon :I be serious
I am serious! Check out gravitational singularities, there are actual mathematical infinities within black hole theory when dealing with them. To solve them we need to combine general relativty and quantum which has not been done and verified yet. Or modify both! : )
i hate astrophyiscs its too much info XD
But such great info! : )