Chapter 11, Problem 70P

BIO Bat echo A bat emits short pulses of sound at a frequency of $\text{1}\text{.60 }\times {\text{ 10}}^{\text{5}}$

Hz. As the bat swoops toward a flat wall at speed 30 m/s, this sound is reflected from the wall back to the bat. (a) What is the frequency of sound incident on the wall? (b) Consider the wall as a sound source at the frequency calculated in part (a). What frequency of sound does the bat hear coming from the wall?