Bats can detect small objects such as insects that are of a size on the order of a wavelength. if bats emit a chirp at a frequency of 69.3 khz and the speed of sound waves in air is 330 m/s, what is the smallest size insect they can detect? give your answer in mm (millimeters)
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The smallest size of the insect that the bats can detect corresponds to the wavelength of the chirp they emit. Their chirp has a frequency of and the speed of the chirp is equal to the speed of sound in air: Therefore the wavelength of the chirp is which corresponds to a size of 4.76 mm.