The sound emitted by bats has a wavelength of 4.13 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

Explanation:

hope it helps

see earlier answer

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.