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To demonstrate the phenomena of interference, we require
(1) Two sources which emit radiation of the same frequency
(2) Two sources which emit radiation of nearly the same
frequency
(3) Two sources which emit radiation of the same frequency
and have a definite phase relationship
(4) Two sources which emit radiation of different wavelengths
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Answer / ali
( 3 ) Two sources which emit radiation of the same frequency
and have a definite phase relationship
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