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# OCR PHYSICS B G491~ 19th May 2015 AM ~ AS Physics watch

1. I got DAB as well
2. (Original post by jirapat121)
It's 1 mark for correct choice.
1 mark for explaining why it is good for this application
1 mark for explaining the microstructure
Thats not too bad then, 4/6 marks- hopefully i will make it up elsewhere
3. (Original post by Alex Gerrow)
I got 4.8, but don't think I did very well this year!
1/v = 1u + 1/f

1/f = 1/v - 1/u
= 4 + 0.8
I think you're right
4. I think I ballsed up the bird chirrup what did you guys put for features and number of oscillations?
5. (Original post by IrfanR)
I got DAB as well
What's DAB?

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6. (Original post by GabrielSmith1998)
I did DAB for the materials. I panicked during the paper and did not properly talk about microstructure.
I put DAB
Then crossed it out for DBB

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7. (Original post by PepperPotts)
I think I ballsed up the bird chirrup what did you guys put for features and number of oscillations?
1500
Defo between 40-45 for an A. Would be surprised if its was higher than 46 or something.
what do you think will be a D,C and B?
9. (Original post by Fandalf)
That was the WORST paper. That's coming from a person who found last year's fine. **** YOU OCR
Did you get D, C, B for the 3 graphs?
10. This has to be <40 for an A. Way worse than last year!
11. I put that there was more than one frequency combined together and that it was within the range of 2 and 4kHz??
12. (Original post by CancerousProblem)
1500
Aah, would you mind explaining?
13. average frequencey approximately 3khz
duration half a second
3000 x 0.5 = 1500
14. (Original post by PepperPotts)
Aah, would you mind explaining?
I think that I took some readings off the graph to find:
1. The time period of the overall chirp
2. The average frequency of the chirp oscillations
3. Multiplied them together to find the number of oscillations
15. So, how does everyone think it went. I thought it was pretty easy tbh.
16. Could be have used either resistance for the resistivity one?
Most in my class used 3.14
Some used the 200 and something

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17. (Original post by CancerousProblem)
1/v = 1u + 1/f

1/f = 1/v - 1/u
= 4 + 0.8
I think you're right
Got this too as 1/u is -0.8
18. (Original post by scarr08)
I put that there was more than one frequency combined together and that it was within the range of 2 and 4kHz??
100 and 10khz so 9900

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19. Pretty much have to ace the unit 2 to stand a chance of getting an A
20. Can't use the lens equation because there was no image only two objects

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