Echoes of bats and men Echoes of bats and men echoesofbatsmen00grif Year: 1959 ECHOES OF BATS AND MEN Fig. 11. The frequency and wave length of a bat's sound vary during each chirp. This diagram, which is approximately to scale, illustrates the small amount of sound reflected by one insect. United States begin each of their orientation sounds at about 90 kc and end at 45 kc. Since each sound lasts only about 2 milliseconds, this is a very rapid change in frequency; indeed, this bat sweeps through a frequency band double the whole range of the human ear in 2 86

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