AQA PHYSICS A Level UNOFFICIAL MARK SCHEME - 15th June 2017

im more than sure this question was a 2 marker because i was wondering where the second mark came from as i didnt realise how to work the angle out for ages stupidly. and i got 225N not 113N dont know which is correct though

What was part b of the Ladder Question?

What was part b of the Ladder Question?

I think the surface area was 32cm^2 for the solar cell which gives like 3.2 x 10^-4 m^2 and hence a final answer of 263Wm^-2??

7.3s for blocks to come down.
12s to reload
19.3s total.
Trolleys with block sent down 93 times (1800/19.3)
186 blocks in total (2 blocks per trolley).

The mistake a lot of people made was that they did 0.75 x actual acceleration. Question said in practice a break decreases it TO 25% of maximum acceleration, not BY 25% of maximum acceleration.

Got most of it correct. Did a few mistakes in the forced vibration questions and in the ladder question. I predict bout 20/25 for MC and perhaps 45/60 for rest. About 65/85 is my prediction for that paper. Hopefully, that's an A. Physics doesn't count for me/uni offer. Decent/standard paper maybe slightly harder. I'd say 60-65% for an A would be standard.

I think it was 1.46Mev
which will give wavelength=8.09*10^-13m

Particles-1,2,3,3
Refraction-1,2,3
Electricity-2,4,3
String-2,4,2
Ladder-1,2,4,2
Trolleys-1,2,2,3,2
SHM-3,2,4

I think the surface area was 32cm^2 for the solar cell which gives like 3.2 x 10^-4 m^2 and hence a final answer of 263Wm^-2??

7.3s for blocks to come down.
12s to reload
19.3s total.
Trolleys with block sent down 93 times (1800/19.3)
186 blocks in total (2 blocks per trolley).

The mistake a lot of people made was that they did 0.75 x actual acceleration. Question said in practice a break decreases it TO 25% of maximum acceleration, not BY 25% of maximum acceleration.

Got most of it correct. Did a few mistakes in the forced vibration questions and in the ladder question. I predict bout 20/25 for MC and perhaps 45/60 for rest. About 65/85 is my prediction for that paper. Hopefully, that's an A. Physics doesn't count for me/uni offer. Decent/standard paper maybe slightly harder. I'd say 60-65% for an A would be standard.

I'm 99% sure it said reduced by 25%, i reread that part multiple times to make sure

for the momentum of the block i put that A would have a larger momentum than B since they are both moving with the same velocity and A has a larger mass?

thats what i put but ive seen people tell me the mass is the same for both so the momentum is the same and im really confused

I'm 99% sure it said reduced by 25%, i reread that part multiple times to make sure

Just remembered this and I hope I didn't over think it. There was a multiple choice question on the photoelectric effect where the wavelength was doubled. I initially thought that the max KE increased and the electrons remained the same. On second though I changed my answer to the max KE increased and the number of electrons decreased. Half the wavelength means double the frequency so each photon has double the energy. However the question said the intensity of light remained the same so to get the same intensity (power per unit area) you must have half the number of photons since the are now carrying double the energy? Is this right?

I also thought this but I only briefly checked it over so I could be wrong

yes this is correct

Thank you.

Thank you.