Question

Bats chirp at high frequencies that humans cannot hear. They use the echoes to detect small objects, such as insects as small as one wavelength. If a bat emits a chirp at a frequency of 60.0 kHz and the speed of sound waves in air is 340m/s, what is the size in millimeters of the smallest insect that the bat can detect?

Answer 1

Solution :-

Using, v = fλ

i.e. λ = v/f

we get, λ = 340/60000

= 0.0057 m

= 5.7 mm

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