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

1. (Original post by Lizzieee4)
I thought the physics ones weren't stolen though
They weren't, physics was unaffected AQA even said

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2. Can anyone explain what electron diffraction has got to do with unit 5?

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3. (Original post by Dante991)
Can anyone explain what electron diffraction has got to do with unit 5?

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Its used to estimate the radius of the nucleus
4. (Original post by Mai.H)
Its used to estimate the radius of the nucleus
How though?

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5. (Original post by Mai.H)
Its used to estimate the radius of the nucleus
I won't go into that much detail coz i dont think the experiment part is that important but heres a few points that may be useful
Its a more accuarate method in comparison to the alpha particles because electrons dont experience the snf so there is no electrostatic repulsion electrons display wave particle duality so they can be diffracted
A moving electron has a de broglie wavelength at high speeds
Electron scattering is easier to interpret
Electrons five less recoil and greater resolution

equations: Rsintheta=0.61*lambda

E=hc/lambda

its come up in the past as a 6 marker assessing its advantages and disadvantages
6. (Original post by Lizzieee4)
Yeah, sorry that's what I meant hahaha. Just slowly loosing it after having biology yesterday....
how did you find biology?
7. Good luck everyone! Let's smash it

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8. (Original post by Mai.H)
I won't go into that much detail coz i dont think the experiment part is that important but heres a few points that may be useful
Its a more accuarate method in comparison to the alpha particles because electrons dont experience the snf so there is no electrostatic repulsion electrons display wave particle duality so they can be diffracted
A moving electron has a de broglie wavelength at high speeds
Electron scattering is easier to interpret
Electrons five less recoil and greater resolution

equations: Rsintheta=0.61*lambda

E=hc/lambda

its come up in the past as a 6 marker assessing its advantages and disadvantages
Thanks!

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9. Guys june 2012 q 1 c can anyone explain ?

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10. (Original post by Mai.H)
how did you find biology?
I do OCR, but the paper was wayyyy to synoptic. You could've gotten away without revising at all which is really annoying. It was too much of a suggest/imply your knowledge for my liking
11. Last exam then suummmmmeeeerrrrrrr! This one better not put a downer on things!
12. (Original post by king cobra)
Guys june 2012 q 1 c can anyone explain ?

Sorry 2013 I meant

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13. (Original post by thedontom)
Last exam then suummmmmeeeerrrrrrr! This one better not put a downer on things!
Can u explain q 1 c in 2013 core thanks

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14. (Original post by Lizzieee4)
I do OCR, but the paper was wayyyy to synoptic. You could've gotten away without revising at all which is really annoying. It was too much of a suggest/imply your knowledge for my liking
oh ok I'm with aqa but i know what you mean my paper last year was like that!
15. 1ci or 1cii
16. Just to clear things up for those who weren't sure:
Physics Unit 4 was NOT affected by the stolen van
However Unit 5 IS, so we are getting the reserve paper today
Thanks AQA
17. (Original post by examiningboard)
Just to clear things up for those who weren't sure:
Physics Unit 4 was NOT affected by the stolen van
However Unit 5 IS, so we are getting the reserve paper today
Thanks AQA
hope its a good paper!
18. (Original post by NightStrider)
Its below the line, take a look at the specimen paper
every single graph I have seen has said its normallly when more than 80 protons and 120 neutrons
19. I personally don't think the 6 marker will be on the gas law derivation. It may possible come up as maybe a 3/4 marker but not the 6. It just doesn't have the right appeal to it, it's more formulas than quality of written communication.
20. (Original post by examiningboard)
I personally don't think the 6 marker will be on the gas law derivation. It may possible come up as maybe a 3/4 marker but not the 6. It just doesn't have the right appeal to it, it's more formulas than quality of written communication.
For a 6 marker could they mark you down if you used bullet points or do you have to write in paragraphs? I've always been told to write in paragraphs :/

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