To demonstrate the phenomenon of interference, we require two sources which emit radiation (a) of nearly the same frequency (b) of the same frequency (c) of different wavelengths (d) of the same frequency and having a definite phase relationship

Answer: (d). A steady interference pattern needs coherent sources. Coherent means same frequency and a constant (definite) phase difference. So the answer is (d) of the same frequency and having a definite phase relationship.

To demonstrate the phenomenon of interference, we require two sources… | JEE Main 2003 (AIEEE)

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Superposition, Coherence & Intensity

To demonstrate the phenomenon of interference, we require two sources which emit radiation

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Answer: (d)

A steady interference pattern needs coherent sources.
Coherent means same frequency and a constant (definite) phase difference.
So the answer is (d) of the same frequency and having a definite phase relationship.

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Superposition, Coherence & Intensity question from JEE Main 2003 (AIEEE)

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