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Two sources of sound moving with same sp...

Two sources of sound moving with same speed v and emitting frequency of 1400 Hz are moving such that one source `s_1` is moving towards the observer and `s_2` is moving away from observer. If observer hears beat frequency of 2 Hz. Then find the speed of source. Given `v_(sound) gt gt v_(source)` and `v_(sound) = 350m/s`

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