First slide

Intensity of

Question

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

Moderate

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

Solution

If two waves of nearly equal frequency superpose, they give beats if they both travel in straight line and $I_{\min}$ = 0 if they have equal amplitudes.

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