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

1. anyone doing astro get 15m diameter for the cassegrain

and poor detail?
2. (Original post by k9000)
The turning points question on measuring light speed.. Anyone do distance over time?
Other than that it was fine, some answers i got:
24V
11m
250 muons
First box
4.69x10^5V
I'm pretty sure I got 24V, 11m and the first box! I had no idea what to do for that muon question, and I can't remember what I got for the last question :")
3. (Original post by 000alex)
Feel sorry for the examiner that gets my papers, both of my 6 markers had 20% full of scribble and crossed out
We were supposed to do this?
Yeah, with pressure or volume on the y-axis.
4. how was section a
5. Easy paper

6. Anyone else get 47233 so 47000 on the latent heat one
7. (Original post by sophiebeth100)
Posted from TSR Mobile

That sounds much more logical, but I expected to screw up the lens equation anyway. how did you find the rest of the medical paper?
I thought it was pretty good, I did kinda panic on the question about sound, but ended up guessing that the straight line was the dB scale because intensity is uniform across the whole range of frequencies and the curved line was dBA because it accounts for the sensitivity of the ear, one of the points on the curve was the threshold of hearing at 1000Hz and the other point was the frequency at which the human ear is most sensitive
8. (Original post by wat a wizard)
anyone doing astro get 15m diameter for the cassegrain
Yep
9. (Original post by 000alex)
Feel sorry for the examiner that gets my papers, both of my 6 markers had 20% full of scribble and crossed out
We were supposed to do this?
yeah but i didnt draw graph explained it
10. (Original post by 000alex)
Feel sorry for the examiner that gets my papers, both of my 6 markers had 20% full of scribble and crossed out
We were supposed to do this?
I did this but with volume against tempt as it is easier to measure than pressure
11. (Original post by wat a wizard)
anyone doing astro get 15m diameter for the cassegrain
Yep, I think so
12. Now I'm far from the best student so DON'T go by these values but I just want to see if anyone got any the same as me.....

Nuclear and thermal:
0.05, 5.00
1.4*10-15 m
5.3*10-15 m
1.3*10^17 kgm-3
3.3*10-6 s-1
8.2*10^11
47000J
160000
319 K

Astro:
2.4*10^11
15m
-82
5000 K
97*10^6
8.8*10^21
4.9*10^17
13. (Original post by StarvingAutist)
-8.7*10^-3

seems wrong but whatever
I got that
14. (Original post by wat a wizard)
anyone doing astro get 15m diameter for the cassegrain

and poor detail?
Pretty sure you're supposed to use llamda = 1.0 micrometer because they gave the smallest resolving power of the telescope.
15. (Original post by HenryHein)
Yes, like 000alex' sketch but in words (also explained you could plot P against T as well), so with V against t pressure was constant and P against T, V was constant
What a guess!
16. How did you find the radius of that nucleus we were given?
Anyone else get 47233 so 47000 on the latent heat one
yeah
18. (Original post by bwr19)
Yes that's what I got! A very small negative.

Think I put this in my calc:

1.981 - 5log(25/10)

??
That's what I did too
19. I ****ed up the absolute mag question because I thought the 0.009 or whatever value was too low and wasn't sure whether to use metres of parsecs for d

Really pisses me off that I had it but chose to write some other ****ed up value using metres....
20. (Original post by dominicwild)
How did you find the radius of that nucleus we were given?
use the formula?

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