Hi guys! I have also filmed some past paper questions practice. Hopefully it is helpful! : ) kzbin.info/www/bejne/pKa3lZWPgZ2LZq8
@zoyajalal64332 жыл бұрын
You have no idea how helpful your videos are....I'm so grateful....your way of explaining and covering each and every point is Just Amazing. Thank you so much. I've got my CIE A2 Physics tomorrow.
@mdarmanhossain21532 жыл бұрын
I really feel like God sent you as an angel to help me with my exam 😭. Thank you so much!
@zhelyo_physics2 жыл бұрын
No problem! Good luck revising!
@Vigilant692 жыл бұрын
I'm super glad that you exist, love your explanation dear sir!
@zhelyo_physics2 жыл бұрын
Thank you! Glad this is useful! : )
@kxaie2 жыл бұрын
Fantastic video, helped alot, only thing is at the end with the section about dark matter, that section replayed.
@zhelyo_physics2 жыл бұрын
Glad you enjoyed it. Thanks for letting me know, will fix that 😀
@DRMAOMMAIZEINNG5 ай бұрын
awesome video, really helped for my upcoming exams, which is starting with paper 1. One thing to point out is that you seem to accidently repeat the dark matter section twice, not sure if this was intentional or not.
@gjeraldh29892 жыл бұрын
Thank you, it is helpful to revise after my lessons.
@zhelyo_physics2 жыл бұрын
Glad it is helpful!
@enurih3543 Жыл бұрын
Thank you for this video! This was incredibly helpful!
@zhelyo_physics Жыл бұрын
Great to hear! Thanks for the comment!
@nonviablegerm715 ай бұрын
Absolute legend, thanks so much for the video!
@zhelyo_physics5 ай бұрын
anytime! thanks for the comment!
@neuropcs58792 жыл бұрын
Incredibly helpful! Thank you :)
@zhelyo_physics2 жыл бұрын
Glad to hear so! Thanks for the comment!
@gautammorkhandikar394 Жыл бұрын
do we need to know about the doppler effect or just the equation for doppler shift in OCR? Also are we expected to know red shift and blue shift?
@zhelyo_physics Жыл бұрын
the equation is given in the formula booklet, and you need to know how to use it, together with red shift/blue shift. Good luck revising!
@gautammorkhandikar394 Жыл бұрын
@@zhelyo_physics thank you!
@bigboyali23125 ай бұрын
quick question! If hubble's constant a... constant, and if the age of the universe is 1 divided by hubble's constant does that mean the age of the universe is constant? frozen in time? or is hubble's constant isnt really a constant and just changes with time? in that case what would a hubble's constant against time graph look like?
@zhelyo_physics5 ай бұрын
such a great question!! Hubble's constant is not actually a constant....in time : ) Actually it is a constant in space meaning that it is the same at every location in the universe (so far as we can tell), but it's value is actually changing with time. Hope this helps, great question!
@nadiaaaj66182 жыл бұрын
awesome. thank you so much. hope this helps me on on test next week
@zhelyo_physics2 жыл бұрын
Glad to hear! Best of luck on the test!
@Zecos6 ай бұрын
wow studying the big bang has made my belief in religion stronger!!!! it sounds soo stupid and even science cant explain the universe!! tysm physics ilysm :)
@ibaba-ez3om5 ай бұрын
lmao frr
@justinlash Жыл бұрын
i]s ]this sequence of big bang ]] enough for full marks
@zhelyo_physics Жыл бұрын
always depends what the question is asking, they are rarely on memory, typically they would throw in some specific data or something similar to comment on the question
@emmanuelige98895 ай бұрын
Hi sir, do you agree with this statement or am I incorrect. If the lab wavelength is shorter than the measured wavelength then the object is moving away (Redshift), and if the lab wavelength is longer than the measured wavelength, then the object is moving closer (Blueshift).
@zhelyo_physics5 ай бұрын
I agree
@hectorpearson3390 Жыл бұрын
thank you for vid, gl ppl
@zhelyo_physics Жыл бұрын
Anytime! Good luck!
@yana10672 жыл бұрын
hi hi, a quick question that i kinda need clarifying, if we got asked a question on the big bang, would we need to know the time stamps? for example it was 380000 years after the big bang when the universe started to cool down, would the time have to be stated?
@zhelyo_physics2 жыл бұрын
I am gonna go with no. The spec doesn't explicitly state that you need to know the times, but you need to know the sequence.
@yana10672 жыл бұрын
@@zhelyo_physics ohh okay thank you!
@kausarlolz4 ай бұрын
hi sir, do we need to know the time for the big bang processes? for ocr a
@zhelyo_physics4 ай бұрын
I’d revise it but not stress about it as paper 3 is typically more problem solving based. You never know though. Good luck tomorrow!
@xodusgraphicdesigns338410 ай бұрын
Thanks for the video really good, i like how you don’t put in useless info. Can you do a specific big bang video because the ocr exam i have done requires more info on the Big Bang. E.g the universe is hot and dense…
@zhelyo_physics10 ай бұрын
excellent idea! thank you so much!
@udayreddy3705 Жыл бұрын
hi sir i came across this formula where light years = 1AU/ 1 light year. Is this right ? And if so when is it really used?
@zhelyo_physics Жыл бұрын
never seen it before, it's not correct too I am pretty sure as the dimensions on the left (units of distance), don't equal the dimensions on the right. Where did you come across it?
@mikhaelhalbar4172 жыл бұрын
Amazing video thank you so much
@zhelyo_physics2 жыл бұрын
Glad you enjoyed it!
@Allinone-nm2jh5 ай бұрын
thank you very much sir .
@zhelyo_physics5 ай бұрын
anytime! thank you for the comment!
@SorabeeZ6 ай бұрын
do you need to know ab olbers paradox, open,closed,flat universe and their graphs and critial density for OCR A? ive seen it come up in topic questions but its not something we learnt in school.
@zhelyo_physics6 ай бұрын
Hi, they are not, they used to be on the OCR spec before 2017, however not anymore.
@videoharry_ Жыл бұрын
6:03 does Δλ/λ = -v/c rather than just v/c as you’ve put. In your “all of astrophysics” you put the former equation but in this you have the latter. I assume the former is correct?
@zhelyo_physics Жыл бұрын
So the two exam boards have chosen slightly different variations of the same equation.
@jameshosking85415 ай бұрын
Do I need to know the exact value of an astronomical unit?
@withtheflow85285 ай бұрын
If you're on the OCR A exam board it is in the formulae booklet
@Crimseno5 ай бұрын
@@withtheflow8528 U got to remember the exact value for the astronomical unit for OCR A, its 1.5 x 10^11m. Idk bout the other exam boards.
@supersloths70526 ай бұрын
Is this video for the AQA specification?
@zhelyo_physics6 ай бұрын
Nope - I have filmed the whole of AQA astrophysics here: kzbin.info/www/bejne/a52aaWqoqZyWr5Ysi=JsDOQS0-wAuwRLQM Enjoy!
@barnaby42322 жыл бұрын
Does the AU value need to be remebered and do we not need to know the fate of the universe?
@zhelyo_physics2 жыл бұрын
Hi, which spec are you doing? For OCR I would remember the astronomical unit, the fate of the universe is no longer on the OCR spec though. If you are doing a different exam board it might be different
@barnaby42322 жыл бұрын
@@zhelyo_physics yes I am doing OCR I assumed it was on the spec as it’s in the textbook, maybe it’s out of date
@naturemc22 жыл бұрын
thanks!
@zhelyo_physics2 жыл бұрын
Anytime!
@naturemc22 жыл бұрын
@@zhelyo_physics if you add some historical information about how we get the hubble law and why parsec is useful and important. It would be great
@zhelyo_physics2 жыл бұрын
I agree! Thanks for the idea!
@jefferylarry-w5w Жыл бұрын
do we need to know the mnames of the guys who invetend the background radiation theory.
@zhelyo_physics Жыл бұрын
nope!
@jamiebarnes48042 жыл бұрын
awsome video really helped me a lot in understanding parsecs but just as a side note i think you forgot to convert nm to meters for the doppler shift or i could be completely wrong
@zhelyo_physics2 жыл бұрын
Hi, thanks! So with the Doppler Shift, because you are using change in wavelength/wavelength the units will cancel so no need to convert in a fraction. Hope this helps!