The minimum intensity of sound is zero at a point due to two sources of nearly equal frequencies, when
A
Two sources are vibrating in opposite phase
B
The amplitude of two sources are equal
CAt 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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CAt 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
c (c) 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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