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A bat transmits ultrasonic clicks made of sound of frequency 80 kHz; the clicks have a duration of 0.1 ms.?
A bat transmits ultrasonic clicks made of sound of frequency 80 kHz; the clicks have a duration of 0.1 ms. The bat increases the clicking rate from about 20 Hz to 2 kHz as it nears its prey. An echo from an unwary moth initially returns after 20 ms. Find the wavelength of the ultrasound, and the number of waves in a click. What is the initial range of the moth and why does the bat increase its click rate?
wave length of ultrasound=1/f=1/80x10^3=12.5x10-6=12.5microsecond
number of waves in a click=click time/wavelength of ultrasound
=.1x10^-3/12.5x^-6=8
-the echo time=20ms --->20ms/2=10ms for the sound to reach the moth and 10ms to get back to the bat
speed of ultrasound depends on the meduim the wave travels in
speed in air is known to be 330m/s
distance=speed*time=330m/s*10x10-3s
=3.3m
good luck 
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