To demonstrate the phenomenon of interference, we require

Options :
  1. two sources which emit radiations of the same frequency
  2. two sources which emit radiations of different wavelength
  3. Two sources which emit radiations of different wavelength
  4. two sources which emit radiations of the same frequency and have a constant phase difference
Answer and Explanation :-

Answer: Option 4

Explanation:

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Your time may come. Do not be too sad, Sam. You cannot be always torn in two. You will have to be one and whole, for many years. You have so much to enjoy and to be, and to do.
-J.R.R. Tolkien The Return of the King