The sound emitted by bats has a wavelength of 4.38 mm. what is the frequency in air? the speed of sound in air is 343 m/s.

The frequency of a wave is equal to the linear speed divided the wavelength. so in equation form.
f = v / l
where f is the frequency
v iss the linear speed
l is the wavelength

f = ( 345 m/s ) / ( 4.38 mm ) ( 1 m / 1000 mm )
f = 78767 per second

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