Unit: waves
Year: 1989 Question#: 52
Question: Coherent light of wavelength 6.4 x 10-7 meter passes through two narrow slits producing an interference pattern on a screen with the first order bright bands 2.0 x10-2 meter from the central maximum. The screen is 4.0 meters from the slits. What is the distance between the slits?
(1 ) 2.6 x 10-6 meter
(2 ) 3.2 x 10-9 meter
(3 ) 1.3 x 10-4 meter
(4 ) 7.8 x 103 meter
What is this question really asking?
Explanation by: Cory V (partly)
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Answer 1
2.6 x 10-6 meter
INCORRECT
Try this formula
where 
= wavelength
d = the distance between the slits
x = the distance from the central maximum to the first order maximum
L = the distance from the slits to the screen
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Answer 2
3.2 x 10-9 meter
INCORRECT
Try this formula
where 
= wavelength
d = the distance between the slits
x = the distance from the central maximum to the first order maximum
L = the distance from the slits to the screen
return to top Answer 3
1.3 x 10-4 meter
CORRECT
You used
correctly.
where 
= wavelength
d = the distance between the slits
x = the distance from the central maximum to the first order maximum
L = the distance from the slits to the screen
return to top Answer 4
7.8 x 103 meter
CORRECT
Try this formula
where 
= wavelength
d = the distance between the slits
x = the distance from the central maximum to the first order maximum
L = the distance from the slits to the screen
return to top What's this question really asking?
What is the distance between two slits, if the coherent light of wavelength 6.4 x 10 to -7-2return to top
