Question

The necessary condition for phenomenon of interference not to occur is…….

(a) There should be two coherent sources

(b) the frequency and amplitude of both the waves must be same

(c) the propagation of waves should be simultaneously and in same

direction

(d) sources should be wide
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Answer 1

Answer:

(c) the propagation of waves should be simultaneously and in same

direction

Explanation:

Interference is a phenomenon in which two waves super impose to form a resultant wave of greater or lower amplitude. Interference usually refers to the interaction of waves that are correlated or coherent with each other, either

because they come from the same source or because they have nearly same frequency. Option C satisfies the above conditions.

Answer 2

Explanation:

(c) the propagation. of waves should be simultaneously and in same