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Among the two interfering monochromatic ...

Among the two interfering monochromatic sources A and B, A is ahead of B in phase by `66^@`. If the observation be taken from point P, such that `PB-PA=lambda//4`. Then the phase difference between the waves from A and B reaching P is

A

`156^(@)`

B

`140^(@)`

C

`136^(@)`

D

`126^(@)`

Text Solution

Verified by Experts

Total phase difference
`=` initial phase difference `+` phase difference due to path
`=66^(@)+(360^(@))/(lambda)xxDeltax`
`=66^(@)+(360^(@))/(lambda)xx(lambda)/(4)=66^(@)+90^(@)=156^(@)`
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