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

1. (Original post by QueNNch)
Guys what was the range of
- Alpha
- Beta

I wrote 0.1 to 1m for alpha and 10-15m for beta had no idea
The questions previously stated something about maximum range. But
I was a little put off by this; I couldn't find the statement 'ignore relativistic effects' anywhere on the question; so I just guessed with 0.5m and 3m.

(In truth I don't really know, and as it would appear the ranges will vary dependent on speed of the particles)
2. for tha gold fold if a mixture of istopes of gold is added would the scattering change ? (1 marker)
3. (Original post by EconFan_73)
Bout half way through Astro
Oh thank god thought I'd messed up.
4. (Original post by Ninja_heel)
Doubt it defo an easy paper
Did you do astro?
5. (Original post by MangoFreak)
I think I got that yeah, to 2 s.f.

What question was that?
For the lead one it was Q 4 or 5 on Section A (where they asked us to calculate the energy transferred to lead to heat it to it's melting point, then it melts.

For the 16000K one I think it was an Astrophysics question to find the black body temperature of a star
6. (Original post by Faaiz Shah)
How did peopel calculate the density of the nucleas??
Density = m/V
Calculate volume from 4/3πr^3
Take r from previous question.

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7. (Original post by Faaiz Shah)
Easy 6 markers dont make up for calculations . Some calculations in turning points were kinda tricky.
Talking about the astro section bro
8. (Original post by TheRAG)
Do you think I'll get the mark for putting alpha is 0.05m and beta 0.1? (I've seen the alpha range to be 5cm on other papers)
I dunno as in the textbook it explicitly says 100mm and 1m
9. (Original post by Faaiz Shah)
How did peopel calculate the density of the nucleas??
Mass of nucleons / volume of nucleus
10. (Original post by AR_95)
**** this. Not checking any comments or mark schemes to get my self depressed over the summer

The paper was ok. Section A was straight forward APART FROM THE ****ING 6 MARKER

Section B was Hard (turning points) but the 6 marker was just bliss!!!
What was the hard bit in TP? Only 3~4 marks were hard. The rest were straight forward questions imo. I think 5D will have 62 for an a* and 54 for an a. Last year was much harder
11. (Original post by QueNNch)
Density = m/V
Calculate volume from 4/3πr^3
Take r from previous question.

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Phew!!! Was mass Au ??
12. For Astro, did people get the temp of the star to be 16000K or 5000K? If 5000K why?
13. (Original post by Lizzieee4)
You didn't have to write how to carry out the experiment I don't think
Yeah, I don't think you needed detail of apparatus, to a great degree. But just for 6 marks I didn't write much, compared to your average 6 mark question. So it feels as if things were missed out.
14. (Original post by RemainSilent)
for tha gold fold if a mixture of istopes of gold is added would the scattering change ? (1 marker)
No as isotopes have different number of neutrons which does not affect the electrostatic charge of the nucleus.
15. (Original post by RemainSilent)
for density did anyone get 1.63*10^17?
Yep
16. (Original post by RemainSilent)
for tha gold fold if a mixture of istopes of gold is added would the scattering change ? (1 marker)
No proton number is same

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17. (Original post by TheRAG)
For the lead one it was Q 4 or 5 on Section A (where they asked us to calculate the energy transferred to lead to heat it to it's melting point, then it melts.

For the 16000K one I think it was an Astrophysics question to find the black body temperature of a star
Yeah, haha, the mention of temperature made me worried I'd messed up a thermal question, but I didn't do Astro so that's good
18. (Original post by QueNNch)
I wrote that !

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Oh FFS I thought it was MORE! So I put blurred!!
19. (Original post by Ninja_heel)
Talking about the astro section bro
Woops
20. (Original post by mrno1324)
Did you do astro?
Yes mate

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