Question

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

• A. nearly the same frequency
• B. the same frequency
• C. different wavelength
• D. the same frequency and having a definite phase relationship.

Answer 1

The correct option is D the same frequency and having a definite phase relationship.

To demonstrate interference, to coherent sources are required. Sources are called coherent when they emit waves of nearly equal or equal frequency and a constant phase difference throughout.