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AS Physics P1 MCQs Preparation Thread.

Raweeha

Raweeha

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Okay, how would you solve this (common format of Qs, repeated) How can you solve it without knowing the distance between the grating and screen? :confused:
This one is from w09.

26. A parallel beam of light of wavelength 450nm falls normally on a diffraction grating which has 300 lines/mm.
What is the total number of transmitted maxima?
A 7
B 8C 14
D 15
 
Mairaxo

Mairaxo

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Raweeha said:
Okay, how would you solve this (common format of Qs, repeated) How can you solve it without knowing the distance between the grating and screen? :confused:
This one is from w09.

26. A parallel beam of light of wavelength 450nm falls normally on a diffraction grating which has 300 lines/mm.
What is the total number of transmitted maxima?
A 7
B 8C 14
D 15
Click to expand...
Is it A?
 
Raweeha

Raweeha

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Yaay well done! Okay, check my method please: to find d it's 1/300 x 10^-3, right?
 
Mairaxo

Mairaxo

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okay so d=1/N right? so N is 300 lines per mm i gues so convert it to m u get 300000. then d=1/300000. then divide that by 450*10^-9 and ul get 7.4 or something. multiply it by 2 and u get 14.8 :p
 
Raweeha

Raweeha

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Got it finally!
May Allah reward you for persevering with my thick-headed-ness (sorry physics is not my thing)
Thank you :)
 
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