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Two waves of wavelength 2 m and 2.02 m ...

Two waves of wavelength 2 m and 2.02 m , with the same speed, superimpose to produce 2 beats per second ,The speed of each wave is

A

` 400 ms ^(-1)`

B

` 404 ms ^(-1)`

C

` 402 ms ^(-1)`

D

` 406 ms ^(-1)`

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The correct Answer is:
A
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