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# OCR B Physics H157/01 Fnd in Physics 24th May 2016

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1. My teacher said that the electron wavelength was twice what everyone thought because it was a standing wave
2. (Original post by dfbenjamin)
My teacher said that the electron wavelength was twice what everyone thought because it was a standing wave
Yes it was because it reflected off the iron atoms and I assume that the electrons are coherent?
3. What do you think the grade boundaries will be like compared to other years?
4. That paper was terribly difficult, I was not expecting this at all!

Hoping grade boundaries are between 60-65% for an A
5. (Original post by swagmister)
In the old spec it was usually around 70% for an A and lots of people found it difficult maybe around 48 for an A?
That's like 68.5%!
It'll probably be like 43 or 44/70
6. (Original post by Fetty_Wap)
Hey what did everyone get for that question where you had to estimate the amount of bits used in the signal with the graph? i put 5 bits, is that right?
It was 4 bits because there were only 16 levels so log^2(16) =4
7. Did anyone else put A down in succession for a few of the multiple choice
8. (Original post by DarkAvenger)
It was 4 bits because there were only 16 levels so log^2(16) =4
I thought it was 8 and there was 3 samples for each level and 2 to the power 3 is 8 :/
9. (Original post by DarkAvenger)
That's like 68.5%!
It'll probably be like 43 or 44/70
Yeah your probs right especially with it being a new spec
10. Is there an unofficial mark scheme?
11. (Original post by swagmister)
I can't remember if the question said or not but usually for those kind of questions they ignore air resistance
If there is no air resistance how could it reach terminal velocity. It may accelerate until it reaches ground
12. (Original post by DarkAvenger)
It was 4 bits because there were only 16 levels so log^2(16) =4
I counted 17 levels.... dammit
13. Last question, OCR put in the table Distance (s) when it should be Distance (m). Good job.

Hope I've got at least a C.
14. (Original post by JZ0120)
If there is no air resistance how could it reach terminal velocity. It may accelerate until it reaches ground
Yeah I get it now I messed up on that question 😒
15. (Original post by jjcoolio)
I counted 17 levels.... dammit
Wait...where are you getting these levels from? I counted 8 so I must have misinterpreted the graph.
16. (Original post by Z-Dust)
Wait...where are you getting these levels from? I counted 8 so I must have misinterpreted the graph.
I just counted every plateau there was.... not necessarily correct!
17. (Original post by Watevaidc)
Got 24.63 for the velocity of the crash or something like that
is there an noficial mark scheme
18. is there an uunofficial mark scheme guys
19. Does anyone have the practice papers?

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20. Any predictions as to whats coming up in depth?

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