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

1. (Original post by Ninja_heel)
What was the star is astro?

Main sequence
Giant
White dwarf
I put main sequence
2. (Original post by Sbarron)
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
For the one you got 160,000 i thought you were supposed to square them first then add them, and then divide by 3?
3. (Original post by dominicwild)
How did you find the radius of that nucleus we were given?
[your value of r0] * cuberoot54 or whatever A was
4. For the first question on astro as it gave the distance from the sun in AU and it wanted the distance to the earth so do you take away 1AU from the largest distance given and this would give the distance to the earth

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5. Same I got 3m
6. very last calculation about temperature, on section ahow did you do it?
7. (Original post by FirelightPhoenix)
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 :"
I left muon till last as it looked difficult but it was just a relativity question unstructured :/. The 6 marker was a gift though.. I finished at charge on the droplet and how to measure then said charge is always n*1.6x10-19.. It didnt say mass of the electron needed measuring right?
8. (Original post by dominicwild)
Apart from the 6 marker on nuclear and thermal. I thought that was good. I had literally 0 idea how to answer that 6 marker!
It was related to Charles' law or the pressure law I think
9. (Original post by SuperMushroom)
For the first question on astro as it gave the distance from the sun in AU and it wanted the distance to the earth so do you take away 1AU from the largest distance given and this would give the distance to the earth

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I think it said largest distance, so you add 1AU not take away (3.57AU in total?)
10. Was it 3m or 15m.
It said smallest angle, so this is when the wavelength is smallest? (1nano not 5 nano)
11. Did anyone of you guys use charles/pressure do the graph and shiz and then repeat at higher pressure/ volume and draw another line.. Same x intercept confirms absolute zero?
12. (Original post by superduperbob)
I put main sequence
it was a white dwarf
13. (Original post by HenryHein)
I think it said largest distance, so you add 1AU not take away (3.57AU in total?)
Hmmm I'm not too sure then, I took away 1AU

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14. For the questions it said show that the value is 'about' x, such as show it was 1.4*10^-15 m and you get 1.43*10^-15, for the next part in the questions do you use 1.43 or 1.4? or doesn't it matter?
15. (Original post by 000alex)
Was it 3m or 15m.
It said smallest angle, so this is when the wavelength is smallest? (1nano not 5 nano)
I got 3

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16. The amount of bull I wrote for the astro 6 marker was too damn high
17. (Original post by xela238)
The temperature was 5000k not 16000, the value you used was the peak intensity, not the peak wavelength, the peak wavelength was the value as far right as possible
Noo its not?

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Anyone else get 47233 so 47000 on the latent heat one
For that did you work out Q for Q=mcT and Q=ml and add them ?
19. I got 3m for diameter

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20. (Original post by SuperMushroom)
For the first question on astro as it gave the distance from the sun in AU and it wanted the distance to the earth so do you take away 1AU from the largest distance given and this would give the distance to the earth

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No, you add it. The largest distance is when the earth is on the opposite side of the sun compared to.. the thing

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