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

(1) Two sources are vibrating in opposite phase

(2) The amplitude of two sources are equal

(3) 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

(4) Both the sources are in the same phase

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