The little brown bat is a common species in North America.
Chapter 17, Problem 17.24(choose chapter or problem)
The little brown bat is a common species in North America. It emits echolocation pulses at a frequency of 40 kHz, well above the range of human hearing. To allow researchers to hear these bats, the bat detector shown in FIGURE 17.30 combines the bats sound wave at frequency f1 with a wave of frequency f2 from a tunable oscillator. The resulting beat frequency is then amplified and sent to a loudspeaker. To what frequency should the tunable oscillator be set to produce an audible beat frequency of 3 kHz?
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