Two em waves are emitted by two separate sources with a constant zero phase diff

Question

Two em waves are emitted by two separate sources with a constant zero phase difference and both reach a certain point. In which of the following cases will constructive interference happen?

a. The two waves travel distances from their source to that point that differ by a quarter wavelength.

b. The two waves travel distances from their source to that point that differ by one whole wavelength.

c. The two waves travel distances from their source to that point that are not exact multiples of a wavelength.

d. The two waves travel distances from their source to that point that differ by a half wavelength.

Explanation / Answer

Two em waves interfere constructively when the path difference between them is equal to integral multiples of their wavelength. They interfere destructively when the path difference between them is equal to half-integral multiples of their wavelength. Hence, the right option is b.

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