beat_heard_by_a_bat - The Beat Heard by a Bat Description...

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The Beat Heard by a Bat Description: Find the velocity of a bat that flies toward a wall while emitting a high-frequency sound, given the beat frequency heard by the animal. A bat flies toward a wall, emitting a steady sound of frequency 2.00 kHz. This bat hears its own sound plus the sound reflected by the wall. How fast should the bat fly to hear a beat frequency of 10.0 Hz? Take the speed of sound to be 344 m/s. Express your answer numerically in meters per second to two significant figures. Because the bat is moving as he emits a frequency, the frequency will be shifted by the Doppler ef- fect. The frequency the bat hears will be f beat = | f 1 - f 2 | 10 = | 2000 - f 2 | f 2 = 1950 , 2010 Doppler effect : f = f o v ± v o v v s where f = observed frequency f = emitted frequency v = speed of sound v o = speed of observer v s = speed of observer How to chose signs : upper limits (+ on numera- tor, - in denominator) if source (observer) is mov- ing towards the observer (source). Lower limits (- in numerator, + in denominator) if source (ob-
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