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1) A bat flying at 4.00 m/s is chasing an insect flying in the same direction. If the bat emits a 40.0-kHz chirp and receives back an echo at 40.4

1) A bat flying at 4.00 m/s is chasing an insect flying in the same
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
345 m/s.)


Image: http://www.webassign.net/sercp8/14-14.gif


(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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