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

1. (Original post by chizz1889)
No change as charge of gold nucleus unchanged, force was electrostatic repulsion
I put changed because different sized nuclei.... (Different number of neutrons)
2. (Original post by TheRAG)
Did we all get 318/320K for the last (Part A) Q on temperature of a gas?
Something like that; I can't remember the exact figure
3. (Original post by k9000)
Wasn't the density 1.3 something x10^17?
Was the mass A times by atomic mass unit??
4. (Original post by MangoFreak)
What's the whole thing out of? 100?
75
5. (Original post by RemainSilent)
i put 16111K as the grpah was somehting like rounded ?
Yeah I calculated 16111.11 but rounded my answer
6. (Original post by Faaiz Shah)
I agree it was easy . The calculations were straight forward. But in my school alot of people found it difficult and made tiny mistakes in large calculations..

Anyways did u get 4.12 to thE something for the 2nd last turning points one??
Dunno where the 2 is coming from but I got 4.1*10^7
7. (Original post by mrno1324)
Yeah but neutron isn't, hence radius isn't constant hence gap width isn't constant.
Doesn't matter about gap width as it's not electron diffraction, it's Rutherford scattering, defect relies solely on the charge of the nucleus of the foil
8. (Original post by MangoFreak)
What's the whole thing out of? 100?
66-67 /75 for full ums
9. (Original post by DAVZ125)
What was the radius of the star where the temperature was 16000K?
(4.2x10^24)/(øx16000^4)=4piR^2 R was the only unknown variable
10. (Original post by MangoFreak)
What's the whole thing out of? 100?
No out of 75
11. (Original post by k9000)
75
Right yeah of course I'm thinking about it like my chem papers 62/100 for an A* would be ridiculous.
12. (Original post by Gome44)
What did people put for the astro 6 marker?
1.1 * 10 ^ 5 speed and 4 days time period
13. For the AstroGuys, what type of star was it? (Main Sequence, White Dwarf, Red Giant)
14. (Original post by Sbarron)
I put changed because different sized nuclei.... (Different number of neutrons)
That won't affect Rutherford scattering as it only depends on the amount of electrostatic repulsion
15. (Original post by MangoFreak)
Dunno where the 2 is coming from but I got 4.1*10^7
Thats good enough hopefully. Didnt specify rounding
16. (Original post by Faaiz Shah)
66-67 /75 for full ums
What for 115 ucas points??
17. (Original post by DomRauba)
was it a white dwarf guys and is the interaction electromagnetic?
i put main sequence and yes electromagnetic
18. (Original post by Ninja_heel)
(4.2x10^24)/(øx16000^4)=4piR^2 R was the only unknown variable
something to the power 6, maybe 9.5
19. (Original post by MangoFreak)
What's the whole thing out of? 100?
So the raw marks are out of 75 and the UMS is out of 120. On the June 11 paper for 5D, 67 raw marks=120UMS, 61 was 108UMS(A*) and 55 was 96UMS(A).
20. (Original post by Faaiz Shah)
Was the mass A times by atomic mass unit??
Yeah, fairly certain i got around 1.36x10^17 or something close to that for the density

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