Two identical sources moving parallel to each other at separation ' d ' are producing sounds of frequency ' f ' and are moving with constant velocity v 0 . A stationary observer ' O ' is on the line of motion of one of the sources. Then the variation of beat frequency heard by O with time is best represented by: (as they come from large distance and go to a large distance)
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Due to Doppler effect apparent frequency of S 1 will continuously decreases. But apparent frequency of S 2 changes to lower value when it crosses o so best represented graph is.
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