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

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Two sources are vibrating in opposite phase

The amplitude of two sources are equal

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

Both the sources are in the same phase

answer is C.

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Detailed Solution

If two waves of nearly equal frequency superpose, they give beats if they both travel in straight line and Imin= 0 if they have equal amplitudes.

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