A) having a constant phase difference
B) of equal wavelength
C) of equal speed
D) having same shape of wave front
Correct Answer: A
Solution :
Phase difference \[=\frac{2\pi }{\lambda }\times \](path difference) The phase difference is independent of time and depends only on the path difference \[({{x}_{2}}-{{x}_{1}}).\] This holds only if the two sources are coherent, ie, they have a constant fixed phase difference between them.
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