Bats are mainly active at night. They have several senses that they use to find

Question

Bats are mainly active at night. They have several senses that they use to find their way about, locate prey, avoid obstacles, and "see" in the dark. Besides the usual sense of vision, bats are able to emit high-frequency sound waves and hear the echo that bounces back when these sound waves hit an object. This sonar-like system is called echolocation. Typical frequencies emitted by bats are between 20 and 200 kHz. Note that the human ear is sensitive only to frequencies as high as 20 kHz.

a) Find the wavelength of the 80.0- KHz wave emitted by the bat.

b) Will the bat be able to locate the moth despite the darkness of the night?

Explanation / Answer

a)

The frequency of the sound wave f = 80 kHz

The wavelength of the wave will be = v/f

v is the speed of the sound

= 343 m/s / 80000 Hz

= 4.2875 mm

b)

The bat be able to locate the moth, despite the darkness of the night, as the emitted sound from the bat will reflect at the moth(target) and can be heard(echo) by the bat.

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