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# Edexcel Physics U4 IAL (WPH04/1) Watch

1. do we have to use area to calculate charge when calculating the capacitance in the second last question?
2. (Original post by skeletonboy1)
yeah as i remember, and we only need to resolve when calculating velocities but no need when calculating K.E. right?
Yep.
3. (Original post by omar5478)
I got 3.41, I believe I calculated it by (6.9 - 6cos30)/cos60 (total horizental momentum before = total horizental momentum after)
Ah yes. That's what I did! I guess I must have gotten the same, just can't remember it
4. (Original post by AvWOW)
yup I did the same.
haha everyone was saying they remembered it from IGCSE and I was like "what really"
Oh ffs that actually makes sense. I guess I could say goodbye to the A*
5. (Original post by omar5478)
The only irritating question was the change of momentum of the alpha particle, how did you do that ??
I've forgotten the question, but I think it had something to do with E_k = p^2/(2m) or something along those lines.
6. (Original post by omar5478)
Oh ffs that actually makes sense. I guess I could say goodbye to the A*
Hey that was just 3 marks.. I'm prob losing more than that
7. (Original post by Zacken)
I've forgotten the question, but I think it had something to do with E_k = p^2/(2m) or something along those lines.
yeah i used that equation too but i used a mass of 2u instead of 4u fml
8. (Original post by skeletonboy1)
do we have to use area to calculate charge when calculating the capacitance in the second last question?
Yeah I did
9. (Original post by Zacken)
I've forgotten the question, but I think it had something to do with E_k = p^2/(2m) or something along those lines.
I did that to calculate the initial momentum (7.8 * 10^something) but didn't know how to progress beyond that.

Edit: I just figured out that this value would be the change of momentum because at minimum seperation there would be no velocity. I didn't write that down though and wrote F = p/t below the calculation, do you know how many marks would I lose ??
10. (Original post by Zacken)
I've forgotten the question, but I think it had something to do with E_k = p^2/(2m) or something along those lines.
A question very similar came up in January 2016
Question 18 C

Papers and Markschemes
11. for the mc questions:
deflection is higher or lower?
momentum change = sqrt(2)p?
12. (Original post by omar5478)
I did that to calculate the initial momentum but didn't know how to progress beyond that.
You'll get a mark at least.
13. I think I messed up the question about the wavelength. I used E=hf and then c=f(lamda) which I think could be right...
But then I confused getting Ek. How was that supposed to be done?
14. (Original post by oli4rg)
A question very similar came up in January 2016
Question 18 C)

Markscheme
Yep, Q16 also came up as Q11 in ours. Q15 came up in ours as well. It's basically the same paper with different numbers.

(Original post by skeletonboy1)
for the mc questions:
deflection is higher or lower?
momentum change = sqrt(2)p?
Dunno what the deflection bit you're talking about is. Are you talking about the last question about exiting the field? If so, it exits at C.

Momentum change = 2p.
15. (Original post by omar5478)
I got 3.41, I believe I calculated it by (6.9 - 6cos30)/cos60 (total horizental momentum before = total horizental momentum after)
3.41 is correct and collision is wlastic
16. (Original post by omar5478)
I got 3.41, I believe I calculated it by (6.9 - 6cos30)/cos60 (total horizental momentum before = total horizental momentum after)
3.41 is correct and collision is elastic
17. I would say this is quite a fair paper without a lot of those tricky explaining questions that need you to think
18. Do you divide the wavelength you got by 2?
19. divided the energy by two... i worried they might deduct marks if i divide the wavelength instead
20. what did you do in the last part of the capacitor question that a calculation was needed?

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