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Two sources , separated by a certain dis...

Two sources , separated by a certain distance, are each producing a sound of frequency 1360 Hz . A listener from the middle of the two sources starts moviing towards a source . If the number of beats heards by the listener per sound is 4, calculate his speed . Velocity of sound in air = 340 m ` s^(-1)`

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The correct Answer is:
[ 0.5 m ` s^(-1)`]
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