Question 16. To demonstrate the phenomenon of beats we need (a) Two sources which emit radiation of nearly the same frequency (b) Two sources which emit radiation of exactly the same frequency (c) Two sources which emit radiation of exactly the same frequency and have a definite phase relationship (d) Two sources which emit radiation of exactly the same wavelength Answer
To demonstrate the phenomena of interference, we require two sources which emit radiation of the same frequency and have a definite phase relationship.
