A person fires a pistol near the opening of a deep vertical well. Half a second later, the person hears the echo of the pistol firing. How deep is the well? (Use 344 m/s for the speed of sound.)
A) 168 m
B) 120 m
C) 98 m
D) 86 m

Question

Quizplus · Accepted Answer

The sound travels to the bottom of the well and back in 0.5 seconds. Therefore, the time for the sound to reach the bottom is 0.25 seconds. Using the speed of sound (344 m/s), the depth is 344 m/s * 0.25 s = 86 m.

A Person Fires a Pistol near the Opening of a Deep