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A Mexican free-tailed bat can detect small objects such as a fly whose size is no smaller than one wavelength of the sound the bat

A Mexican free-tailed bat can detect small objects such as a fly whose size is no smaller than one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 60.9 kHz, and the speed of sound in air is 337 m/s, what is the smallest fly a bat can detect?

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