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Homework Help: phsyics

Posted by Jake on Thursday, July 19, 2012 at 9:39pm.

Bat is flying 5m/s while chasing an insect that is flying in the same direction. The bat emits 40kHz chirp and hears a 40.4kHz reflected sound wave. What is the speed of the insect?

??? lost

• phsyics - drwls, Friday, July 20, 2012 at 12:23am

  The reflected sound has a higher frequency, so the insect is approaching.
  
  (delta f)/f = 0.4/40 = 0.01 = 2 V/a
  
  The number 2 accounts for Doppler shift incident and reflected sound
  
  a is the sound speed. Assume a = 340 m/s
  
  V = 1.7 m/s
  

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