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# AQA Physics P3 higher tier Unofficial Markscheme

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1. (Original post by mediaya)
i did 80x10-6 - 30x10^-6= 50x10^-6
4cm=0.04m
so 0.04/0.000005=8000
but because it is going there and back (full reflection) you had to divide by 2
8000/2 = 4000 m/s

and i know this is wrong because i divided the speed by 2 instead of dividing the TIME by 2
how many marks would i get?

and one more thing, i am rubbish at standard form, that's why i got it so wrong. they shuldnt be allowed to put that in...
You'd get one definitely for applyign the equation, not sure about the other two though.
2. What was the Ray diagram question?
3. (Original post by dianmian12)
The one with the A and B?
yeah
Like that graph with it as well :/
4. (Original post by mediaya)
i put that tower doesn't fall over because the clockwise moment equals the anticlockwise moment so there is a balance and there is no resultant moment
btw, how does the line of action lies within the base? the base was narrower than the sides
thats what i put it asked you to talk about the moments in the question not line of action
5. What did you guys say about the angle of incidence and refraction? It was A and D right??
6. This exam was so hard, what was even going on
7. the speed of the ultraseound wave was 1600 m/s
8. Probably the best unofficial mark scheme I've seen so far. I remember a question about ticking the correct two letters for angle of incidence and angle of refraction. I think the letters were B and D but I'm unsure about whether or not this is correct - could someone clarify???? Cheers
9. What did everyone get for the critical angle of glass? The refractive index was 1.5 i think so i did 1/sin1.5=0.66666....
That seems so wrong btw
10. What did u put for the left hand flemings rule., i git its going PQ goes down
11. (Original post by mediaya)
What did everyone get for the critical angle of glass? The refractive index was 1.5 i think so i did 1/sin1.5=0.66666....
That seems so wrong btw
42
12. (Original post by harison291)
OMG I was seriously getting scared. I don't think I had that question either.
which question?
13. I dunno how but I got 0.5625 for the moments question. I just remembered the example in the CGP book about tension in the girder.
And was the ultrasound question in milliseconds, because I got 0.0004
14. (Original post by chelseafc141)
I dunno how but I got 0.5625 for the moments question. I just remembered the example in the CGP book about tension in the girder.
And was the ultrasound question in milliseconds, because I got 0.0004
OMG same I got 0.5625 too because we did the moment divided by 0.36 (012+0.20), but I'm not sure if it was right
15. Wasn't the last question to draw the converging lens of C to be a thinner shape as it had a high refractive index or something
16. Isnt the moments question 0.5625 Nm?
1.5 x 1.2 = 1.8
1.2 + 2.0 = 3.2 (distance of the chain from the pivot)
1.8/3.2 = 0.5625
17. (Original post by surina16)
42
Really, how???? 😰
Great i got that wrong again, lets go down to 35 marks then..... 😒😧
18. Tbh the first question answer is because the electromagnet is stronger and m and n is as you move closer to principal axis image gets smaller and upright at principle axis no image formed at m image is smaller and inverted

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19. (Original post by Akila1)
Isnt the moments question 0.5625 Nm?
1.5 x 1.2 = 1.8
1.2 + 2.0 = 3.2 (distance of the chain from the pivot)
1.8/3.2 = 0.5625
No it was 1.1 nm
20. (Original post by mediaya)
Really, how???? 😰
Great i got that wrong again, lets go down to 35 marks then..... 😒😧
1.5 = 1/sinC
sinC = 0.666...
C=42(2sf)

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