Two sources are called coherent if they produce waves (a) of equal wavelength

Monjur Alahi

Two sources are called coherent if they produce waves
(a) of equal wavelength

(b) of equal velocity

(c) having same shape of wavefront

(d) having a constant phase difference.


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Salim Ahmed Kawsar

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(d) having a constant phase difference.

EXPLANATION:

 By definition, the two sources are called coherent if the initial phase difference does not change with time i.e. the phase difference remains constant.

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