A child stands in a valley and faces a large mountain. The child shouts “Hello!"
and waits for the echo. The echo returns in 2.5 seconds. Assuming that sound
travels at 340 m/s in the valley, how far away is the mountain that caused the
echo?
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Ответ:
Beat frequency=f2-f1 (f2>f1)
Beat frequency=332Hz-300Hz=2Hz