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# AQA Physics PHYA5 - 28th June 2016 [Exam Discussion Thread] watch

1. (Original post by kingaaran)
I think you'll be fine - it sounds valid
Phew. For the volume one after compression and raise in temperature, my volume actually increased and I got like 0.27 something mols, I'm sure I got it wrong
2. (Original post by duncant)
yea this paper was pretty difficult. I didnt get the first calculation to do with the eye. I remember getting 57% for the x ray calculation to do with 12mm. what about you?
What calculation was that???

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3. Any idea what the ums is going to be, same as other years?
4. for the tick boxes question it was to break all intermolecular bonds as the others implied the same thing ie increase in speed kinetic energy.

Increase in temperature question molecular increase in speed as they gain kinetic enrgy up to a maximum value i think u had to state max value her possibly.

0.034 for some distance question in turning points
and for the question after the proof of 1-v^2/c^2 it was the 3km and length contraction so some 0.036 m etc smaller value in meteres as asked.
5. (Original post by particlestudent)
I didn't mention aluminium at all . I said plot count rate against 1/distance squared and if it is a complete straight line then it is only a gamma emitter
I only put something along the lines of a thin metal sheet between the emitter and the detector as it would stop beta particles and any changes to the count rate would be due to the presence of beta as alpha lacks the range (0.9m). How many marks would I get?
6. (Original post by particlestudent)
Phew. For the volume one after compression and raise in temperature, my volume actually increased and I got like 0.27 something mols, I'm sure I got it wrong
I got 0.066 moles I think. You had to work out the constant of proportionality between P, V and T, use the formula to work out the new volume in the first part and divide the constant by 8.31 to get the number of moles in the second
7. for the first question, did you use the angle as 42.5? in sintheta
8. (Original post by CourtlyCanter)
I only put something along the lines of a thin metal sheet between the emitter and the detector as it would stop beta particles and any changes to the count rate would be due to the presence of beta as alpha lacks the range (0.9m). How many marks would I get?
Probably 2 out of 2, that is technically the main valid way of checking
9. (Original post by kingaaran)
That is clever Definitely going to get credit there
I don't think so.. I think it needed to be mentioned to put aluminium between:/ hopefully will get a nice market ahah

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10. (Original post by Mango Milkshake)
for the first question, did you use the angle as 42.5? in sintheta
I used 42, is this 42.5 figure meant to be significant? I jus read off the graph
11. (Original post by kingaaran)
I got 0.066 moles I think. You had to work out the constant of proportionality between P, V and T, use the formula to work out the new volume in the first part and divide the constant by 8.31 to get the number of moles in the second
yes!!!
12. (Original post by kingaaran)
I got 0.066 moles I think. You had to work out the constant of proportionality between P, V and T, use the formula to work out the new volume in the first part and divide the constant by 8.31 to get the number of moles in the second
do you remember what you got for the new volume? i got something like 3.64x10^-4?
13. (Original post by particlestudent)
I used 42, is this 42.5 figure meant to be significant? I jus read off the graph
should be fine, i read off graph too. they will have a range
14. (Original post by kingaaran)
I got 0.066 moles I think. You had to work out the constant of proportionality between P, V and T, use the formula to work out the new volume in the first part and divide the constant by 8.31 to get the number of moles in the second
Okay I got that wrong then
15. Didn't correct for count rate, 1 or 2 gone.
Unit for latent wrong - 1 gone.
Detecting beta - 1 gone.
6 marker - default 2 gone.

Used wrong method for specific charge - 3 gone.
Current - 2 gone.
6 marker - default 2 gone.

So 13 lost. Then presumably losing however many more for mark schemes that are stupidly specific or contradictory.

Probably got around 50, which should hopefully be around an A.
16. (Original post by Mango Milkshake)
for the first question, did you use the angle as 42.5? in sintheta
used 42
17. I'm such an idiot!!! I didn't see the last question in the astrophysics paper... it was so blended in
18. (Original post by tanyapotter)
do you remember what you got for the new volume? i got something like 3.64x10^-4?
i think i got that
19. (Original post by kingaaran)
I got 0.066 moles I think. You had to work out the constant of proportionality between P, V and T, use the formula to work out the new volume in the first part and divide the constant by 8.31 to get the number of moles in the second
Lol all you had to do for the moles question was 0.0012/0.018 for the moles. Where 0.0012 and 0.018 were the volumes given. You could just use p1v1/t1 = p2v2/t2 for the part earlier, no need to calc the constant.
20. (Original post by kingaaran)
I got 0.066 moles I think. You had to work out the constant of proportionality between P, V and T, use the formula to work out the new volume in the first part and divide the constant by 8.31 to get the number of moles in the second
The number of moles is constant, was same for the first or second which is why it didn't specify before or after. There are numerous ways to do it because they told you the number of moles in a specific amount of volume in the question.

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