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Two points lie on a ray are emerging fro...

Two points lie on a ray are emerging from a source of simple harmonic wave having period 0.040. The wave speed is 300 m/s and points are at 10 m and 16 m from the source. They differ in phase by:

A

`pi`

B

`pi//2`

C

`0 or 2pi`

D

none of these

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The correct Answer is:
A
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