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The minimum intensity of sound is zero a...

The minimum intensity of sound is zero at a point due to two sources of nearly equal frequencies when

A

two sources are vibration in the opposite phase

B

the amplitude of two sources are equal

C

at the point of observation, the amplitudes of two S.H.M. produced by two sources are equal and both the S.H.M. are along the same straight line

D

both the sources are in the same phase

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The correct Answer is:
C
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