OCR A AS Physics 2019 depth (17th May) Unofficial Markscheme

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localmemelord
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How did everyone find it?
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Decoder
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What did you get for the stool question where you work out the area of one leg
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Physicsobsessed
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I thought it was a really good exam. Quite easy tbh but i'm worried the grade boundaries will be really high.
(Original post by localmemelord)
How did everyone find it?
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thekidwhogames
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It was okay I guess

Distance it travels 0.9
Voltage in Y 5.4
Chargw 10.8 C
Enrgy 58J
Velocity of Y is 1.5 the other cos current
4.6eV
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thekidwhogames
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(Original post by Decoder)
What did you get for the stool question where you work out the area of one leg
1.1*10^-4?
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thekidwhogames
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Density 1200
Ulpthrust 0.1?
K was like 12.54
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Physicsobsessed
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yes that sounds very familiar


(Original post by thekidwhogames)
1.1*10^-4?
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thekidwhogames
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Can you check my other answers
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Physicsobsessed
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We got the same answers for literally everything but what was your answer for the phase difference in radians?
(Original post by thekidwhogames)
Can you check my other answers
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peeked
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(Original post by Decoder)
What did you get for the stool question where you work out the area of one leg
Yeah I got 1.1x10^-4 as well
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thekidwhogames
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(Original post by Physicsobsessed)
We got the same answers for literally everything but what was your answer for the phase difference in radians?
Pi/4
Intensity ratio was 9
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peeked
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For the last one I just talked about how electrons can be diffracted and how they can also produce interference patterns, hopefully explaining these 2 points was enough for the 4 marks
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Ryan0887
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For the pressure question there's a range of values
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thekidwhogames
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Yeah and carbon atoms spacing comparable to wavelength and interference pattern
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localmemelord
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Was that for the last question?


(Original post by thekidwhogames)
Yeah and carbon atoms spacing comparable to wavelength and interference pattern
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peeked
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(Original post by thekidwhogames)
Yeah and carbon atoms spacing comparable to wavelength and interference pattern
Aight nice, I put this too, so yeah that last question wasn't bad at all
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MeiSucks
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What Pressure Question???
(Original post by Ryan0887)
For the pressure question there's a range of values
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Ryan0887
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Sorry I meant the area
(Original post by MeiSucks)
What Pressure Question???
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Ryan0887
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Guys I read the graph wrong and got 8.4 as intensity will I still get the marks as I squared my amplitudes
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peeked
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(Original post by Ryan0887)
Guys I read the graph wrong and got 8.4 as intensity will I still get the marks as I squared my amplitudes
I think you probably will just get one mark at least (out of the 2 I think) for saying intensity is proportional to amplitude^2, I∝A²
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