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The amplitude factor of resulting wave, ...

The amplitude factor of resulting wave, formed by superposition of two sinusoidal waves of equal amplitude a and constant phase difference is given by

A

`2acosphi`

B

`2acos(phi/2)`

C

`2acos(phi/3`

D

`Zero`

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The correct Answer is:
B
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  11. In Young's double slit experiment:

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