Physics Review Question

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 return to top























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

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