The little brown bat is a common bat species in North America. It emits echoloca

Question

The little brown bat is a common bat species in North America. It emits echolocation pulses at a frequency of 40 kHz, well above the range of human hearing. To allow observers to "hear these bats an electronic bat detector combines the bat's sound wave at a frequency f_1 with a wave of frequency f_2 from a tunable oscillator. The resulting beat frequency is isolated, amplified, and then played through a speaker. To what frequency f_2 should the oscillator be set to produce an audible beat frequency of 3.0 kHz?

Explanation / Answer

Given that

frequency f1=40 KHz

beat frequency fb=3 KHz

basing on the concept of waves and oscillations

now we find the frequency should the oscillator be set to produce

fb=f1-f2

3=40-f2

frequency f2=37KHz

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