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# AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread] watch

1. (Original post by C0balt)
I can't help but this that this is gonna have 2014 level high gb lol
Nah it will be lower, like 63/64/65 for 120 ums
2. (Original post by notanooblol)
Nah it will be lower, like 63/64/65 for 120 ums
Idk I feel like ours was easier but maybe I just liked the paper as a personal preference
3. (Original post by C0balt)
Idk I feel like ours was easier but maybe I just liked the paper as a personal preference
Yeah parts were quite nasty but it all depends on what you like as an individual
4. (Original post by C0balt)
Idk I feel like ours was easier but maybe I just liked the paper as a personal preference
I found June 2014 much much harder than this paper... Yet, the boundaries don't seem to imply that.
5. (Original post by CourtlyCanter)
Well it's the same thing since the area of a triangle is 1/2 height(charge) x width (voltage) which is exactly as the formula E=1/2 QV on the formulae sheet you would have otherwise used.
Did you remember to multiply 2.2 by 10^-6 ?
Shouldn't have needed to, the answer was in micro joules IIRC.
6. (Original post by notanooblol)
Nope, its total mark that counts
Thank you! I do really badly on the multiple choice but am better at section B and better at unit 5 so I'm hoping it all works out 😅
7. (Original post by TheLazyGuy1)
it is Y to X because the magnitude was -2F
That's not how magnitude works....
8. Did anyone get the question where you had to show that the energy of the alpha particle was the total energy x some fraction, no one I've talked to at college has got it.
9. what do people think the A and A* boundary will be, given how straight-forward this paper was?

will it be higher than june 2014?
10. (Original post by tanyapotter)
what do people think the A and A* boundary will be, given how straight-forward this paper was?

will it be higher than june 2014?
A* 59, A-52

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11. (Original post by Vikingninja)
Did anyone get the question where you had to show that the energy of the alpha particle was the total energy x some fraction, no one I've talked to at college has got it.
Only got to the part where E(alpha) = E - E(nucleus) = E - 0.5NV^2 and subbed in V^2. So hopefully 2 method marks

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12. Dies anyone remember the voltage values for the change in energy stirred between the 2 in question 1
13. (Original post by Yo12345)
A* 59, A-52

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does that not seem a bit low, given the paper wasn't too bad?
14. No one I know got that algebra one for the Ek, was so hard. Didn't need it for the next part anyway.
15. (Original post by Yo12345)
Only got to the part where E(alpha) = E - E(nucleus) = E - 0.5NV^2 and subbed in V^2. So hopefully 2 method marks

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Pretty much same here XD.
16. Heeey, how did you guys calculate the additional voltage (if that was the question) from the graph in question 1??
17. (Original post by Vikingninja)
Did anyone get the question where you had to show that the energy of the alpha particle was the total energy x some fraction, no one I've talked to at college has got it.
This is what I did
Attached Images

18. (Original post by tanyapotter)
does that not seem a bit low, given the paper wasn't too bad?
majority would have dropped 4 marks straight away on that rearrangement question .
majority would have dropped 4 marks straight away on that rearrangement question .
So what u reckon for the gb
20. i got the time constant RC to be 35.4s, the time constant of a discharging capacitor is the time it drops to 63% its original value, since the time to drop 80% was 45s, 1% = 45/80 = 0.5625 .... 63% = 0.5625 x 63 = 35.4 seconds. but no one on this thread seems to have done that, even though i knew i could have used the equation, but this method seemed more legit in my mind. how many marks will i have lost?

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