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Q.

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

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a

Two sources are vibrating in 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

answer is C.

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Detailed Solution

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