the number of beats heard

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A man is watching two trains, one leaving and the other coming in with equal speed of 4 m/s. If they sound their whistles, each of frequency 240 Hz, the number of beats heard
07
Nov
A man is watching two trains, one leaving and the other coming in with equal speed of 4 m/s. If they sound their whistles, each of frequency 240 Hz, the number of beats heard A man is watching two trains each of frequency 240 Hz one leaving and the other coming in with equal speed [...]
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