direction. If the bat emits a 40.0-kHz chirp and receives back an echo
at 40.4 kHz, what is the speed of the insect? (Take the speed of sound
in air to be 340 m/s.)
2) The acoustical system shown in the figure below is driven by a
speaker emitting sound of frequency 732 Hz. (Take the speed of sound as
(a) If constructive interference occurs at a particular instant, by what
minimum amount should the path length in the upper U-shaped tube be
increased so that destructive interference occurs instead?
(b) What minimum increase in the original length of the upper tube will
again result in constructive interference?
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