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A bat flying at 5.25 m/s is chasing an insect flying at 3.49 m/s in the...

A bat flying at 5.25 m/s is chasing an insect flying at 3.49 m/s in the same direction. The bat emits a steady chirp of frequency 2000 Hz.
a. What frequency, f0, does the insect hear?
b. The insect becomes a moving source at frequency f0. What frequency does the bat hear reflected from the insect?
c. The bat hears its own sound, plus the sound reflected by the insect. What beat frequency does the bat hear?

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