URGENT CLARIFICATION ON nλ=dsinθ......
Physics exam discussion - share revision tips in preparation for GCSE, A Level and other physics exams and discuss how they went afterwards.
-
- Reputation:
- Thread Starter
- Full Member
- Posts: 90
URGENT CLARIFICATION ON nλ=dsinθ......Have the G482 module tommorow and I don't have a clue what nλ=dsinθ means can someone give me a clear concise explanation it would be much appreciated...
(plus how does this relate to youngs double slit experiment)
and wtf is nλ and where does dsinθ come from
thanks!!!!!!!!!!!!!!!!!!!!!!
(ps good luck to anyone sitting g482 tommorow) -
- Reputation:
- Full Member
- Posts: 88
Re: URGENT CLARIFICATION ON nλ=dsinθ......Probably won't help now, but its a formula used in diffraction gratings. When light passes through a grating it gets diffracted, and the angle of diffraction is theta. d is the slit spacing through which the light travels through. Lambda is the wavelength of the light and 'n' represents the order number of the fringe. That tells you of it is the first bright fringe away from the central fringe or the second etc.
Source : my brain
-
- Reputation:
- Thread Starter
- Full Member
- Posts: 90
Re: URGENT CLARIFICATION ON nλ=dsinθ......had they exam already but thanks anyway it went pretty well around 90/100 I suspect looking at col's mark scheme.(Original post by HashBrowns)
Probably won't help now, but its a formula used in diffraction gratings. When light passes through a grating it gets diffracted, and the angle of diffraction is theta. d is the slit spacing through which the light travels through. Lambda is the wavelength of the light and 'n' represents the order number of the fringe. That tells you of it is the first bright fringe away from the central fringe or the second etc.
Source : my brain
-
- Reputation:
- Full Member
- Posts: 88
Re: URGENT CLARIFICATION ON nλ=dsinθ......That's good to hear - I believe the grade boundaries for an A are actually around 70% raw score so I wouldn't get too stressed about it. I was just surprised there weren't any complex experimental analysis questions or detailed photoelectric effect descriptions. And I had prepared for those as well.
-
- Reputation:
- Thread Starter
- Full Member
- Posts: 90
Re: URGENT CLARIFICATION ON nλ=dsinθ......I really wasn't to sure on the whole n(lambda)=dsin(theta) thing as well, but according to your MS I didn't drop any marks in that section ha ha!(Original post by teachercol)
and it was on the exam!
Last edited by mora11; 30-05-2012 at 17:20. Reason: silly typo -
- Reputation:
- Thread Starter
- Full Member
- Posts: 90
Re: URGENT CLARIFICATION ON nλ=dsinθ......same, not stressing, 99% sure I have an A, full UMS would be nice though.(Original post by HashBrowns)
That's good to hear - I believe the grade boundaries for an A are actually around 70% raw score so I wouldn't get too stressed about it. I was just surprised there weren't any complex experimental analysis questions or detailed photoelectric effect descriptions. And I had prepared for those as well.
