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ALL CIE PHYSICS DOUBTS HERE !!!

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LekhB:
Can anyone help with that?
Design an experiment to investigate how the intensity of light from a source varies with time.

Rvel Zahid:

--- Quote from: LekhB on April 26, 2012, 05:21:23 am ---Can anyone help with that?
Design an experiment to investigate how the intensity of light from a source varies with time.

--- End quote ---
hey check out this thread! this might help you. :)
http://www.physicsforums.com/showthread.php?t=166961

Ghost Of Highbury:
Can anyone throw some light on the number of significant figures or decimal places we should round off the final answer to?
In Physics/Chemistry paper 4s, paper 5s and Math P3?

For example, I recently solved a Communication system sums and got the answer as 5.3/12 *1000 = 441.6666..7 m

Look what the markscheme says

 "length = 5.3 / 12 km
= 440 m"

I could've rounded it off to 3 s.f and made it 442m. Why does it say 440m then? How do you go about this? Will the deduct marks if the answer
isn't rounded off to the appropriate number of s.f or d.p?

Thanks

SkyPilotage:

--- Quote from: Ghost Of Highbury on May 08, 2012, 03:55:31 am ---Can anyone throw some light on the number of significant figures or decimal places we should round off the final answer to?
In Physics/Chemistry paper 4s, paper 5s and Math P3?

For example, I recently solved a Communication system sums and got the answer as 5.3/12 *1000 = 441.6666..7 m

Look what the markscheme says

 "length = 5.3 / 12 km
= 440 m"

I could've rounded it off to 3 s.f and made it 442m. Why does it say 440m then? How do you go about this? Will the deduct marks if the answer
isn't rounded off to the appropriate number of s.f or d.p?

Thanks

--- End quote ---

I have the same problem too, I dont know if they will deduct marks, but nothing is written about it in the marking scheme or the examiner report.
Sometimes marking scheme says deduct 1 mark if its not 3 s.f.
But I think the reason it is 420 is because 5.3 and 12 are 2 s.f so the answer must be the least s.f of both of them. which is 2s.f = 420 m :)

Ghost Of Highbury:

--- Quote from: SkyPilotage on May 08, 2012, 11:50:03 am ---I have the same problem too, I dont know if they will deduct marks, but nothing is written about it in the marking scheme or the examiner report.
Sometimes marking scheme says deduct 1 mark if its not 3 s.f.
But I think the reason it is 420 is because 5.3 and 12 are 2 s.f so the answer must be the least s.f of both of them. which is 2s.f = 420 m :)

--- End quote ---

420m? 2s.f?

3 s.f no?

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