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# The Physics PHYA2 thread! 5th June 2013 watch

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1. Also on the June 11 paper, how do you do 5d? Any explanations would be greatly appreciated.
2. (Original post by Anonymous1717)
Also on the June 11 paper, how do you do 5d? Any explanations would be greatly appreciated.
I sat that paper, if you can post the question up I can help you.
3. how do you do jan 12 question 7b? The wave travels to the right.
Describe how the vertical displacement of the knot varies over the next complete cycle
Attached Images

4. (Original post by natninja)
I sat that paper, if you can post the question up I can help you.
http://laganphysics.weebly.com/uploa...w-qp-jun11.pdf

Also 7a, what would the graph be like?

5. (Original post by Anonymous1717)
http://laganphysics.weebly.com/uploa...w-qp-jun11.pdf

Also 7a, what would the graph be like?

for 5d it's just quoting and applying the formula sin(c)=n1/n2

&7a is a written 6 marker and there's no graph required...

So I assume you meant 6a which is literally a plot the points and draw a line. Should start as a steep curve and then go shallower towards the top as the metal starts flowing plasticly.
6. (Original post by natninja)
for 5d it's just quoting and applying the formula sin(c)=n1/n2

&7a is a written 6 marker and there's no graph required...

So I assume you meant 6a which is literally a plot the points and draw a line. Should start as a steep curve and then go shallower towards the top as the metal starts flowing plasticly.
Well 7a is about the formula w=(wavelength x D)/s and the mark scheme refers to some sort of way to determine wavelength from a graph. Would you like me to link you the mark scheme?
7. (Original post by RU486)
Could someone help on question 4bi on the June 10 paper please?
Even though it's asking for kinetic energy, you have to use the potential energy formula mgh, so you just do 55*9.81*3.2

Also do you know how to do question 6di from this paper? It's only 1 mark but still can't understand it?

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8. (Original post by Anonymous1717)
Well 7a is about the formula w=(wavelength x D)/s and the mark scheme refers to some sort of way to determine wavelength from a graph. Would you like me to link you the mark scheme?
hmmm let me think a min, you have a formula for the Young double slit experiment, therefore some of the parameters in it could be used for a graph, how about fringe position versus slit seperation? Or even from your fomula a graph such that the gradient is proportional to w/s or wD/s? Bear in mind that the formula is only valid for small angles :P (and why would you use Young's slits for that anyway... a grating monochromator (uses diffraction gratings... reflection ones rather than transmission ones mind) or a Lloyd's mirror apparatus would give better results...)
9. (Original post by natninja)
hmmm let me think a min, you have a formula for the Young double slit experiment, therefore some of the parameters in it could be used for a graph, how about fringe position versus slit seperation? Or even from your fomula a graph such that the gradient is proportional to w/s or wD/s? Bear in mind that the formula is only valid for small angles :P (and why would you use Young's slits for that anyway... a grating monochromator (uses diffraction gratings... reflection ones rather than transmission ones mind) or a Lloyd's mirror apparatus would give better results...)
10. (Original post by Anonymous1717)
No problem I didn't do as well on that paper as I did in the jan2012 retake

Spoiler:
Show
got 108/120 first time round but another guy tried to beat me by retaking his ISAs and so I retook it and got 120/120 :P
11. (Original post by StalkeR47)
It could be on the young's double slit experiment or the reflection/refraction and how do they occur etc. EDIT: It is more likely to be on waves eg, progressive waves such as transverse and longitudinal.
Hey could you answer that question above physics god, thanks

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12. (Original post by Jimmy20002012)
In the spec we don't we need to know about the experiment of reflection or refraction. I think Young modulus will come up, but you know AQA they can unpredictable

Just another quick question, when you given say the critical angle, and you know there is a triangle, could you calculate refractive angle by doing 180-90-critical angle?

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Hey sorry, I was taking a break. Ok, amm.. I am not sure about this bit. Is there a particular question on the past paper? Let me know. It is quiet hard to understand what you are saying. And I think, It depends on the diagram shown.
13. could someone please explain to me what is meant by coherent
14. (Original post by Randy123)
could someone please explain to me what is meant by coherent
Coherent meaning: Two waves are coherent if they have a constant phase difference and same frequency. That is it. For example, the young's double slit experiment.
15. (Original post by natninja)
No problem I didn't do as well on that paper as I did in the jan2012 retake

Spoiler:
Show
got 108/120 first time round but another guy tried to beat me by retaking his ISAs and so I retook it and got 120/120 :P
Why do people use "spoiler"?
16. ok first time im using this but i hope im doing it right
can anyone answer the Q to jan2012 question 5
preferably draw it
THANK YOU
17. (Original post by Jimmy20002012)
Hey could you answer that question above physics god, thanks

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I think if you know the critical angle, angle of refraction can be found by doing the following. 90degrees take away critical angle = angle of refraction. So, you are perfectly correct! Sorry, the first time I was confused.
18. (Original post by Anonymous1717)
Why do people use "spoiler"?
because not everyone bothers to look under it :P
19. (Original post by StalkeR47)
Hey sorry, I was taking a break. Ok, amm.. I am not sure about this bit. Is there a particular question on the past paper? Let me know. It is quiet hard to understand what you are saying. And I think, It depends on the diagram shown.
Bo problem

I have attached the question where you have to find the angle of incidence.

And also could you help the on 2c on the attached question, why doesn't the energy convert to kinetic energy?

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20. (Original post by susanjan123)
ok first time im using this but i hope im doing it right
can anyone answer the Q to jan2012 question 5
preferably draw it
THANK YOU
Yep! I will help you! I am already helping a lot of people. But, which part do you need help with?

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