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(C) When two sound waves of nearly equal frequencies superpose at a point, they produce the phenomenon of beats.The resultant intensity $I$ at any poi

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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

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(C) When two sound waves of nearly equal frequencies superpose at a point, they produce the phenomenon of beats.The resultant intensity $I$ at any point is given by $I = I_1 + I_2 + 2\sqrt{I_1 I_2} \cos(\phi)$, where $\phi$ is the phase difference.For the intensity to be minimum $(I_{\min} = 0)$, the condition is $I_1 = I_2$ and $\cos(\phi) = -1$.This implies that the amplitudes of the two $S.H.M.$ produced by the sources must be equal, and they must be traveling along the same straight line to interfere destructively at the point of observation.

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

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