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# AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread] watch

1. (Original post by CD223)
how do you know?
In the text book
Really well maybe they do accept 30cm i hope so, obviously different sources will have different values as it varies so hopefully 30cm is in AQA's range
I said the gamma rays obey the inverse square law is that wrong
3. (Original post by Doomlar)
My answers for the questions that didn't have a "show that the answer is this" were:

Thermal and Nuclear
Range of = 0.1m
Range of = 2.0m
Density =
Number of nuclei =
Energy used = 47000J

Temperature = 319K

Astrophysics
Maximum distance =
In the 6 mark essay my period was 4 days, and my velocity was 109800 ms-1
Magnitude = -0.01 (definitely derped on this; 1sf and I missed the minus lmao)
Temperature = 16100K
Age of the universe =
Oh dear... I got several different answers there
4. In the AQA Nelson Thornes textbook it says those values, take a look at page 157!
5. Did anyone here do turning points?
For the length contraction one I got 11m
For the muon decaying I got something like 240 muons that make it to earth (2.06 half lives)
For the milikans six marker I talked about the finding charge mass ratio, the density, putting tag force equal to the force from gravity and finding radius from that. Then use radius to find mass and mass to find charge.
For newtons corpuscal theory I said the velocity normal to the substance increases and parallel velocity remains constant.
Thought it wasn't too bad of a section so I'm predicting 56/75 for an A* and 52/75 for an A.. Think I've got around 55-60 so happy overall
6. 50/75 a low B?
7. (Original post by Sbarron)
Oh dear... I got several different answers there
For which bits? This thread seems to have loads of disagreement lmao
8. guys i have a (stupid) ques; basically for astro where you had to tick the star i first ticked white dwarf the crossed out put main sequence cam back crossed this out and circled and put next to the white dwarf box this is the answer with an arrow; and in the expain i also explain why it was a white dwarf; would i get marked down because i was not neat when ticking the boxes as i didnt have a tick but a circle and pointed it out?
9. (Original post by Doomlar)
For which bits? This thread seems to have loads of disagreement lmao
Think it was a paper that contained several dubious questions tbh.
10. (Original post by Emmanuel12344)
I said the gamma rays obey the inverse square law is that wrong
idk if its wrong but thats what i wrote about, hopefully its right
11. (Original post by Emmanuel12344)
I said the gamma rays obey the inverse square law is that wrong
me too and i think it was only a mark ques?
12. It's likely that they will accept a fairly big range for question 1)b) in section A, the range of alpha and beta particles depends a lot on their kinetic energy.
13. (Original post by CD223)
Think it was a paper that contained several dubious questions tbh.
14. (Original post by Doomlar)
For which bits? This thread seems to have loads of disagreement lmao
Well I know not all mine are right but there are Afew of yours that took me by surprise
15. (Original post by CD223)
Think it was a paper that contained several dubious questions tbh.
I agree, I don't think it was the most straight forward paper to be honest. Astrophysics was definitely a bit harder than usual
16. (Original post by Doomlar)
For which bits? This thread seems to have loads of disagreement lmao
It's slowly looking as though the answers wernt quite as straight forward as we all thought. That distance from earth one has annoyed me along with Afew others... I really really hope an A is 52 I've worked so hard and a few silly mistakes can cost you years of hard work 😔
17. Please can somebody explain why the star was a white dwarf and not main sequence? It had an absolute magnitude closer to -10 than 15 so I thought it would be MS.
18. (Original post by Doomlar)
I got...

Thermal and Nuclear
Range of = 0.05m
Range of = 0.3m
Density =
Number of nuclei =
Energy used = 47000J

Temperature = 319K

Astrophysics
Maximum distance = I got totally wrong...
Diameter = 3.0m
In the 6 mark essay my period was 4 days, and my velocity was 114 kms-1
Magnitude = -0.008
Temperature = 16100K
Age of the universe =
19. (Original post by Sbarron)
Well I know not all mine are right but there are Afew of yours that took me by surprise
160000 is wrong on there for a start
20. (Original post by sam_97)
I agree, I don't think it was the most straight forward paper to be honest. Astrophysics was definitely a bit harder than usual
Agreed. Last year was easy compared.

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