Edexcel Physics IGCSE 1P Unofficial Mark Scheme 25th May 2016 Watch

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pro567
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#101
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#101
(Original post by BOBQ)
The hairs weren't dense enough to slow down the uv enough for total internal reflection to occur

(I think)
I asked my tuition teacher he said that TIR does happen on the edges of the hollow tube….there is a small gap between the edge and the hair so TIR takes place there…..however the question ask why it doesnt reach the skin so the answer is absorption…..furthermore to prove this remember they asked us about the image of the UV…..the polar bear was black suggesting it doesnt radiate UV but it is absorbed by the hair…… so its absorption…..plus its 2 marks nothing much to worry about…
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Bede735
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#102
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(Original post by pro567)
I asked my tuition teacher he said that TIR does happen on the edges of the hollow tube….there is a small gap between the edge and the hair so TIR takes place there…..however the question ask why it doesnt reach the skin so the answer is absorption…..furthermore to prove this remember they asked us about the image of the UV…..the polar bear was black suggesting it doesnt radiate UV but it is absorbed by the hair…… so its absorption…..plus its 2 marks nothing much to worry about…
Well your tutor is defying the laws of physics, TIR cannot take place from a low refractive to high refractive index medium, not unless n < 0, which it is safe to say polar bear fur isn't. That was an IR camera, not UV. No creatures skin radiates substantially in UV, to do so it would have to be too hot.
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da lesh
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#103
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#103
Hey I need help please, For the question about motors, the split ring commutators and the brushes, I just put that they prevent the wire from tangling up and switch the direction of the current every half turn so the motor spins in one direction. Did I have to put exactly what the commutator and the brushes did independently or would what I wrote be correct? Thanks.
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da lesh
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#104
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#104
Hey I need help please, For the question about motors, the split ring commutators and the brushes, I just put that they prevent the wire from tangling up and switch the direction of the current every half turn so the motor spins in one direction. Did I have to put exactly what the commutator and the brushes did independently or would what I wrote be correct? Thanks.
(Original post by Bede735)
Well your tutor is defying the laws of physics, TIR cannot take place from a low refractive to high refractive index medium, not unless n < 0, which it is safe to say polar bear fur isn't. That was an IR camera, not UV. No creatures skin radiates substantially in UV, to do so it would have to be too hot.
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kayamh
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(Original post by conradliebers)
Thanks a lot! It was stage 9.
Sorry, could you explain why?
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Bede735
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#106
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#106
(Original post by da lesh)
Hey I need help please, For the question about motors, the split ring commutators and the brushes, I just put that they prevent the wire from tangling up and switch the direction of the current every half turn so the motor spins in one direction. Did I have to put exactly what the commutator and the brushes did independently or would what I wrote be correct? Thanks.
I wouldn't dwell too much on the exam and concentrate on revision for paper 2. However, what you wrote is correct (although the order in which you wrote them would need to be the other way round if they are in the same direction as their use). I haven't seen a mark scheme so I suppose it would depend on how many marks were available for the question.
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conradliebers
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#107
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(Original post by amkay)
Sorry, could you explain why?
You literally just got your ruler out, and at stage 9, the planet and comet were closest to each other.
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VaJJGear
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#108
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#108
It really was a hard exam. Physics was one of the subjects that I could have achieved an A* in, now we're hoping for an A!
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Hsevras
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#109
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(Original post by VaJJGear)
It really was a hard exam. Physics was one of the subjects that I could have achieved an A* in, now we're hoping for an A!
grade boundaries will be low though
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TudorAddict
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#110
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#110
I think it was a challenge and the questions were a bit unusual but after looking at this, I think I did better than I thought I did. Coming out of the exam though, I thought it was very brutal.
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cookie123456789
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#111
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#111
It was possibly the hardest exam I've ever done!
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Tahsin Mamun
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#112
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#112
Mark scheme for 1PR?
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Helper OF ALL
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#113
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#113
IF u GUYZ WANT 1P paper . i have a soft copy of it on my PC.. dont ask me how i got it.. just i have it...TSR plz tell me it isnt illegal to share... if it is then i wont share ....
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laroosey
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#114
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#114
(Original post by Hsevras)
grade boundaries will be low though
hopefully they are low
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Hsevras
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#115
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#115
any predicted topics for tomorrows exam?
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1000000
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#116
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#116
Any predictions???
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pk789
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#117
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#117
(Original post by 1000000)
Any predictions???
physics might be in there


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Hsevras
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#118
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#118
(Original post by pk789)
physics might be in there


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banta
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Hsevras
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#119
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#119
across both papers I think I got 127-134. with grade boundaries in mind do you think that will be an A

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PrincessBabble17
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#120
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#120
(Original post by Hsevras)
across both papers I think I got 127-134. with grade boundaries in mind do you think that will be an A

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yes i think that is definitely an A and it could possibly be an A* depending on boundaries? where did you find the mark scheme for paper 2?
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