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# OCR PHYSICS B G492~ 9rd June 2014~ AS Physics Watch

1. Just google the wavelengths of the electromagnetic spectrum. Try and get some vague numbers in your head. Like for example visible light ranges from 300 to 700 nm. Also, can anyone do question 7 in the jan 2012 paper and tell me why the answer should be in the range 2.0 to 2.2m???? I keep getting 2.6 and I am clueless as to why
2. (Original post by emfp21)
Would you mind explaining that?? All we got told was radio waves have high wavelengths, then as you go through the spectrum to gamma wavelengths decrease due to higher frequency

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Just google the wavelengths of the electromagnetic spectrum. Try and get some vague numbers in your head. Like for example visible light ranges from 300 to 700 nm. Also, can anyone do question 7 in the jan 2012 paper and tell me why the answer should be in the range 2.0 to 2.2m???? I keep getting 2.6 and I am clueless as to why
3. (Original post by shloke123)
Just google the wavelengths of the electromagnetic spectrum. Try and get some vague numbers in your head. Like for example visible light ranges from 300 to 700 nm. Also, can anyone do question 7 in the jan 2012 paper and tell me why the answer should be in the range 2.0 to 2.2m???? I keep getting 2.6 and I am clueless as to why
it is a super weird question because it says you cant be too inaccurate but then if you are too accurate it doesnt accept it, i got the answer with a mixture of counting squares and making a triangle :
0.001x0.5x(22+22+21+22+21+21+20+ 20+20+19+19+18+17+17+16+15+14)+0 .5x0.013x7.0=0.2075 and that is within the range, but there is probably a simple way to do it that we are missing haha
4. (Original post by shloke123)
Just google the wavelengths of the electromagnetic spectrum. Try and get some vague numbers in your head. Like for example visible light ranges from 300 to 700 nm. Also, can anyone do question 7 in the jan 2012 paper and tell me why the answer should be in the range 2.0 to 2.2m???? I keep getting 2.6 and I am clueless as to why
Just tried it, I got 2.8 :/ anyone???

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5. stupid bloody question
6. (Original post by shloke123)
stupid bloody question

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7. Ohhhh i see where I went wrong, I didn't realise the Line with the X was a label, I though it was part of the graph so I included that in my calculations. Such a mug :') cheers for the help mate. The section a and b stuff seems pretty standard from past papers, in fact its pretty easy. Section C seems to be here most of the dodgy questions are
8. (Original post by shloke123)
Ohhhh i see where I went wrong, I didn't realise the Line with the X was a label, I though it was part of the graph so I included that in my calculations. Such a mug :') cheers for the help mate. The section a and b stuff seems pretty standard from past papers, in fact its pretty easy. Section C seems to be here most of the dodgy questions are

9bii from june 11. Any ideas?

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9. Do we need to know anything from g491?? Will any topics come up again?

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10. (Original post by phawkins96)
Do we need to know anything from g491?? Will any topics come up again?

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Considering no g491 was actually in g491 I don't even know anymore

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11. (Original post by Mutleybm1996)

9bii from june 11. Any ideas?

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You've calculated the resultant, add the weight onto that , giving the thrust as R=thrust-weight

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12. Anyone??

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13. (Original post by emfp21)
Anyone??

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June 04 q11ai

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14. Anyone got any important information that they've found out based on the section C questions? Or any advice on things we should predict? :3
15. http://www.ocr.org.uk/Images/59857-q...a-handling.pdf

For question 13 (c) (iv) on the May 09 G492 (page 18), can someone explain why the % uncertainty is given to 1 sf (not 2)? Do you always give % uncertainties to 1 sf or is it due to something in the data given?
16. I think we need to know g491 stuff for section C as in some past papers there have been questions from topics in g491 related to the advanced notice
17. it says in the specifiation they expect us to know g491 stuff, so they may test us on a few things?
18. btw, jan 2012 question 13, surely the gradient gives us s cubed over t squared rather than s over t squared????
19. (Original post by shloke123)
btw, jan 2012 question 13, surely the gradient gives us s cubed over t squared rather than s over t squared????
The y axis is distance, s, in metres and he x axis is the square of the time, t^2, so the gradient change in y/ change in x is s/t^2
20. ohhhhh i seeee, my bad :') I though t squared/ squared was on the x axis, didnt realise s squared was the unit. Thankss, what about the very last question? The mark scheme is very cryptic

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