Chapter 11, Problem 9MCQ

To determine

The observation for a small battery-operated buzzer, which emits sound at a constant frequency of $f_b=3000\text{Hz}$, when dropped from the top of a tall building, from the following options:

a. Sound at constant frequency $f_o=f_b$.

b. Sound at constant frequency $f_o>f_b$.

c. Sound at constant frequency $f_o<f_b$.

d. Sound at increasing frequency $f_o>f_b$.

e. Sound at decreasing frequency $f_o<f_b$.

f. Sound at beat frequency $\left|f_o-f_b\right|$.