Sustained interference patterns

AI Thread Summary
To produce a sustained interference pattern from light waves, coherent sources are essential, as they maintain a constant phase relationship. Monochromatic sources share the same wavelength but may not have the required phase consistency. The discussion highlights confusion over whether coherence alone suffices or if monochromaticity is also necessary. The consensus leans towards coherence being the critical factor for sustained interference. Understanding these properties is vital for analyzing wave interference phenomena.
wakejosh
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Homework Statement


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



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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any help? my brain is melting.
 
The sources should be coherent.

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

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

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