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[" 66.A bat emitting an ultrasonic wave ...

[" 66.A bat emitting an ultrasonic wave of frequency "],[4*5times10^(4)Hz" flies at a speed of "6m/s" between two "],[" parallel walls.Find the two frequencies heard by the bat "],[" and the beat frequency between the two.The speed of "],[" sound is "330m/s" ."]

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