Q.

It is found that when waves from two identical coherent sources superpose at a certain point, then the resultant intensity is equal to the intensity of one wave only. This means that the phase difference between the two waves at that point is

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a

Zero

b

π3

c

2π3

d

π

answer is C.

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Detailed Solution

Resultant intensity  =4a2cos2δ/2 a2→  individual intensitycos2δ/2=14        δ/2=60o      δ=120o=2π3
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It is found that when waves from two identical coherent sources superpose at a certain point, then the resultant intensity is equal to the intensity of one wave only. This means that the phase difference between the two waves at that point is