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The phase difference between two points ...

The phase difference between two points separated by 0.8 m in a wave of frequency 120 Hz is `0.5pi` . The wave velocity is

A

`144 ms ^(-1)`

B

`384 ms ^(-1)`

C

`256 ms ^(-1)`

D

`720 ms ^(-1)`

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The correct Answer is:
B
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