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Sustained interference patterns

by wakejosh
Tags: interference, patterns, sustained
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Apr30-07, 02:58 PM
P: 102
1. The problem statement, all variables and given/known data
In order to produce a sustained interference pattern by light waves from multiple sources, which of the following conditions is sufficient?

a. the sources are coherent
b. the sources are monochromatic
c. no more than two sources are allowed
d. three or more sources are required
e. none of the choices above are valid

3. The attempt at a solution

This question seems messed up to me. From what I understand, both A and B can be correct. I am totally confused. please help if you can, thanks.
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Apr30-07, 03:30 PM
P: 102
any help? my brain is melting.
Aug10-10, 09:29 PM
P: 106
The sources should be coherent.

The coherent sources, by definition, should possess same wave length, same amplitude and same phase or constant phase difference.

But a monochromatic source will possess same wave length but not necessarily be of same phase or constant phase difference.

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