Randall D. Knight — Traveling Waves: Problem 12

You are standing at $x = 0\text{ m}$, listening to a sound that is emitted at frequency $f_0$. The graph of FIGURE Q16.12 shows the frequency you hear during a 4-second interval. Which of the following describes the sound source? Explain your choice. A. It moves from left to right and passes you at $t = 2\text{ s}$. B. It moves from right to left and passes you at $t = 2\text{ s}$. C. It moves toward you but doesn’t reach you. It then reverses direction at $t = 2\text{ s}$. D. It moves away from you until $t = 2\text{ s}$. It then reverses direction and moves toward you but doesn’t reach you.