MCQ
To demonstrate the phenomenon of  interference, we require two sources which emit radiation of
  • A
    nearly the same frequency
  • B
    the same frequency
  • C
    different wavelengths
  • the same frequency and having a definite phase relationship

Answer

Correct option: D.
the same frequency and having a definite phase relationship
d
As for an Interference, Two Sources must be Coherent, hence the two sources must have the same frequency and a definite phase relationship.

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