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Question

A bat emits ultrasonic wave of frequency 30 KHz. If its speed is 350m/s and bats hear its echo after 0.6 sec

after emitting the, find how far is bat from obstacle and wave length of wave?

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Solution

The speed of the wave v, its frequency n and the wavelength of the wave λ are related as,
v=nλ
Or,
λ=vn
On substituting the values in the above equation we get,
λ=350 m/s30 kHz
On converting kilohertz into hertz we get,
λ=350 m/s30×103 Hzλ=0.0117 mλ=1.17×10-2 m

We know that the distance is the product of speed and time, so the distance between the bat and the obstacle is found as,
s=vt
On substituting the values we get,
s=350 m/s0.6 ss=210 m

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