OCR A AS Physics 2019 Breadth (14th May) Unofficial Markscheme Watch

Poll: Marks you think you got
10-20 (0)
0%
20-30 (7)
12.96%
30-40 (7)
12.96%
40-50 (15)
27.78%
50-60 (11)
20.37%
60-70 (14)
25.93%
thekidwhogames
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#41
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#41
(Original post by Decoder)
What's the other condition for an object to be in equilibrium other than resultant force adding to make 0? That was the first question on section B
Resultant moment is 0
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thekidwhogames
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#42
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#42
(Original post by Decoder)
Was it not diagonally downwards? The last choice on that question? Because I measured the vectors with a ruler and the horizontal one was smaller by 0.4 cm
The diagonal had a horziontally component bigger than the original one that was angled and this is impossible s if you resolve them
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thekidwhogames
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#43
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#43
(Original post by Decoder)
There was a multiple choice question on stationary waves in a bottle and I put the first diagram down. The one with nodes and anti nodes. Also what did everyone get for the ball being dropped multiple choice question where you had to use suvat.
stationary waves was C
time 0.144 or something?
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thekidwhogames
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#44
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#44
(Original post by Decoder)
Oh and also the uncertainty multiple choice question which asked which one was the least accurate value for 9.81. I put A for that one.
yes it was A, highest % uncertainity
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thekidwhogames
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#45
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#45
(Original post by mathschem)
what did you guys get for the 6 mark one?
photon absorbed, electron emitted, intensity, threshold, work function, KE max, conservation of energy, 1 to 1 interaction, etc etc.
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thekidwhogames
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#46
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#46
stationary wave was C (Q20) as it was close and open. at close, you have a node and at open, antinode ==>> C

the table about constructive interference - 75 and 95 as path diff is a multiple of lamda
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thekidwhogames
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#47
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#47
average force was 260 by using newtons 2nd law

w=n is wrong cos of newton third law
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Decoder
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#48
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#48
Yep

(Original post by thekidwhogames)
average force was 260 by using newtons 2nd law

w=n is wrong cos of newton third law
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Decoder
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#49
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#49
Could anyone tell me what they wrote for the 4 marker on the displacement time graph - it asked what happens to Velocity over the period of time.
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thekidwhogames
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#50
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#50
(Original post by Decoder)
Could anyone tell me what they wrote for the 4 marker on the displacement time graph - it asked what happens to Velocity over the period of time.
velocity is decreasing as the gradient is getting more negative but magnitude of velocity increasing and it comes to instanreous rest then rebounds (so vpositive velocity but negative gradient e.g. negative acceleration)
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thekidwhogames
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#51
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#51
and v=0 at the end as thats max displacement after rebounding
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fabs_023
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#52
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#52
I found the exam quite hard tbh timing was an issue. Also what did everyone put for the mpc on powers relation to velocity
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zolfikar
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#53
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#53
I did AS physics last year and that **** was hard
(Original post by thekidwhogames)
I think boundaries will remain the same as its slightly harder than last year which was low still
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AlexMurphy122
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#54
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#54
(Original post by Decoder)
There was a multiple choice question on stationary waves in a bottle and I put the first diagram down. The one with nodes and anti nodes. Also what did everyone get for the ball being dropped multiple choice question where you had to use suvat.
It had an anti node at the open end and a node at the closed end so ANAN, for the stationary waves
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AlexMurphy122
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#55
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#55
What did you guys get for the question on the electron gun, where it asked you to prove that the velocity of the electron was about 9x10^6ms^-1? I think I got it to about 8.6x10^6ms^-1 which rounds to 9 obviously but I’m not sure if it should be closer


(Original post by AverageHuman)
Attachment 817894
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GDA Lover
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#56
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#56
Same... I didn't have enough time to finish the MCs and guessed most of them... so sad...
(Original post by fabs_023)
I found the exam quite hard tbh timing was an issue. Also what did everyone put for the mpc on powers relation to velocity
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Decoder
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#57
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#57
Can someone tell me what they put for the multiple choice question on refractive index - which one has a greater critical angle or something? I put the first one (the highest refractive index).
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peeked
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#58
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#58
(Original post by Decoder)
Can someone tell me what they put for the multiple choice question on refractive index - which one has a greater critical angle or something? I put the first one (the highest refractive index).
Yeah same I put the first one, as higher refractive index means smaller critical angle as Sin C = 1/n, but yeah I hope that was right
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thekidwhogames
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#59
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#59
(Original post by peeked)
Yeah same I put the first one, as higher refractive index means smaller critical angle as Sin C = 1/n, but yeah I hope that was right
Yes this should be fine
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thekidwhogames
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#60
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#60
(Original post by AlexMurphy122)
What did you guys get for the question on the electron gun, where it asked you to prove that the velocity of the electron was about 9x10^6ms^-1? I think I got it to about 8.6x10^6ms^-1 which rounds to 9 obviously but I’m not sure if it should be closer
I think this is correct
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