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

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1. (Original post by ursulab)
Does anyone have a drawing of what the TIR into the jewl is supposed to look like?
Diagonally to right, horizontally left, diagonally right

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2. (Original post by Hsevras)
Yes youd get all 3 marks for that

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Yes I know that, I made the mark scheme, haha. The guy just wasn't sure so I was just explaining it to him.
Yes I know that, I made the mark scheme, haha. The guy just wasn't sure so I was just explaining it to him.
apoligies

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4. (Original post by Hsevras)
Diagonally to right, horizontally left, diagonally right

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Thank you
5. Snow is a reflector of UV radiation - that's why you wear sun cream when you go skiing. Therefore the eyes of the polar bear were reflectors and the mouth and body of bear as well as sky were absorbers.
The reason that refractive index has no units is because it is a ratio between the refractiveness of certain objects, however alone it is simply an arbitrary unit.
6. What about the question on which stage is the comet closest to the earth during its orbit? I got the first one (I think the options where stage 7, 8, 9 or 10)
7. (Original post by amkay)
What about the question on which stage is the comet closest to the earth during its orbit? I got the first one (I think the options where stage 7, 8, 9 or 10)
Thanks a lot! It was stage 9.
8. What if I put thermal energy for fission (instead of kinetic) because it heats the water in the reactor to steam that turns the turbine
9. (Original post by BOBQ)
What if I put thermal energy for fission (instead of kinetic) because it heats the water in the reactor to steam that turns the turbine
Ur point's completely valid but I think you'd lose a mark cos they're anal like that

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10. [QUOTE=pk789;65248669]Ur point's completely valid but I think you'd lose a mark cos they're anal like that

ah ok thx
12. I thought there was a lot in the exam for the time limit - I did all the past papers from 2011 and always had 20-30 mins at the end to go over my work. In this exam, I was still 2 questions short with 15 minutes to go, so I had to rush and panicked a little. Only had 1 couple of minutes at the end to go over my work. So not a good performance and expecting a lower grade than on all the past papers.
Just hope the paper 2 is a little kinder as I need to do really well to rescue some of the errors from the first paper
13. Not seen any thoughts about what may be in paper 2.
So will it cover areas not in paper 1
Moments, Momentum, Static electricity, Sankey diagrams and efficiency, Transformers, C-K conversions, marsden and giegar experiment

or can we expect to see questions like - A hunter shoots a polar bear, if the bullet in the gun has a mass of 25g and moves at a speed of 300 m/s what speed will the shooter recoil ? :-)
14. (Original post by pro567)
The hairs weren't dense enough to slow down the uv enough for total internal reflection to occur

(I think)
15. Refractive index is wavelength dependent, so can only suggest that the hollow hair fibre does not have sufficient change in refractive index from the fibre to air for UV light to undergo TIR. Some truly terrible questions on this paper asking what is the examiner thinking.
16. (Original post by coedybrenin)
Not seen any thoughts about what may be in paper 2.
So will it cover areas not in paper 1
Moments, Momentum, Static electricity, Sankey diagrams and efficiency, Transformers, C-K conversions, marsden and giegar experiment

or can we expect to see questions like - A hunter shoots a polar bear, if the bullet in the gun has a mass of 25g and moves at a speed of 300 m/s what speed will the shooter recoil ? :-)
DEFINITELY about the polar bears, or possibly some bees.
17. (Original post by Laith Selman)
I'm pretty sure there was a question about variables. Something about light shining through a hole onto an LDR I think it was. Can anyone remember what they put down as the variables?
Something like a student measuring the amount of light affecting the resistence on a light dependent resistor at a fixed length from the resistor, Used card with different sized holes and recorded results - what was the dependent and independent variables .
Why is it important to keep the distance between the hole and the resistor constant
18. Will 90/120 A*
19. (Original post by Hsevras)
Will 90/120 A*
Borderline maybe. If you think you got that you should study hard for paper 2.
20. (Original post by escg)
the exam was brutal, my god
I did 1pr was literally the best test I've ever did. This mark scheme looks wayyyyy harder than ours

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Updated: June 17, 2016
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