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

For motion of particles, i said collisions with wall of container and other particles are perfectly elastic, and the particles move rapidly and randomly?
I said the time taken during an impact with the container is much shorter than the time between successive impacts, and that the motion is totally random.
2. Right, well now that's over... SUMMER!
3. will there be any unofficial markschemes for part A?? and turning points?
4. I did (Q=MCT)-(Q=ml) will I lose all 3 marks?
5. (Original post by Jed-Singh)
I did (Q=MCT)-(Q=ml) will I lose all 3 marks?
You should get 1 I think
6. (Original post by aprocrastinator)
Medical physics anyone???
Yep
I think I may have put electromagnetic repulsion instead of force because I was thinking of the alpha particles being repelled by the nucleus so I wrote repulsion by accident instead of force -.- would that still be valid for a mark? :/

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I too put Repulsion due to positive charge :/

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8. (Original post by physics01)
Guys did your paper for section b have R on the end of the code
Oooh i actually forgot to check. Did yours?
9. (Original post by Jed-Singh)
I did (Q=MCT)-(Q=ml) will I lose all 3 marks?
If you did it to 2 s.f. you will get 1 mark.
10. I think it was 0.15 m

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11. (Original post by Salt and Peppa)
If you did it to 2 s.f. you will get 1 mark.
I calculated them both separately, then did MCT-ML to 3sf
12. (Original post by Disney0702)
Oooh i actually forgot to check. Did yours?
Yes everyones paper had R on the code. Confirmed.

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13. (Original post by QueNNch)
I'm sure it said "Describe an experiment..."

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You're right it did.
14. What was the answer in the section A nuclear and thermal, what happens to the rutherford scattering using different isotopes? I said it changes because if you used a hypothetical extreme with loads of neutrons, the nucleus would be much bigger and therefore more of the alpha particles path's would be affected by it
15. (Original post by RThornton)
What was the answer in the section A nuclear and thermal, what happens to the rutherford scattering using different isotopes? I said it changes because if you used a hypothetical extreme with loads of neutrons, the nucleus would be much bigger and therefore more of the alpha particles path's would be affected by it
no change as only affected by protons and isotopes have same number of protons I put
16. (Original post by RThornton)
What was the answer in the section A nuclear and thermal, what happens to the rutherford scattering using different isotopes? I said it changes because if you used a hypothetical extreme with loads of neutrons, the nucleus would be much bigger and therefore more of the alpha particles path's would be affected by it
Put why would you use a hypothetical model... The answer was simply no change as the overall charge on the nucleus remains the same,

You over complicated the question

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17. (Original post by RThornton)
What was the answer in the section A nuclear and thermal, what happens to the rutherford scattering using different isotopes? I said it changes because if you used a hypothetical extreme with loads of neutrons, the nucleus would be much bigger and therefore more of the alpha particles path's would be affected by it
Not affect
Isotopes have same number of protons but different number of neutrons
Protons would only affect the path (Can state an equation to further reinforce, I did because I didn't really know how to explain it e.g. R = Q1Q2/4piE0Ek)
Alpha particles never touch nucleus, so only affected by protons of nucleus.
18. (Original post by RThornton)
What was the answer in the section A nuclear and thermal, what happens to the rutherford scattering using different isotopes? I said it changes because if you used a hypothetical extreme with loads of neutrons, the nucleus would be much bigger and therefore more of the alpha particles path's would be affected by it
The nucleus won't be much bigger, adding/removing one or two neutrons will have negligible effect on the spherical volume of the nucleus. It had no effect as the charge of the gold remained the same
19. (Original post by TheRAG)
4.4x1011m
Did you calculate it by taking 1 AU from 2.57AU (whatever the furthest distance was)

or did you calculate it using a triangle with base 1 AU and legnth 2.57AU and take
hypotenuse?
20. (Original post by Disney0702)
You're right it did.
Yeah but it said you didn't need to include any apparatus details so it was basically just describing the measurements/calculations involved in the experiment

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