Questions

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

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Two sources are vibrating in opposite phase

The amplitude of two sources are equal

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

Both the sources are in the same phase

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detailed solution

Correct option is C

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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A metal wire of diameter 1.5 mm is held on two knife edges separated by a distance 50 cm the tension in the wire is 100 N the wire vibrating with its fundamental frequency and vibrating tuning fork together produces 5 beats per second. The tension in the wire is then reduced to 81 N, when the two are excited, beats are heard at the same rate. Calculate frequency of the fork.

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