For the echo to be heard, the sound must travel from the listener to the reflecting surface and then back to the listener.
Distance covered is twice the distance, d, between the listener and the reflecting surface.
Speed, v = 2d/Δt
Assume speed of sound in the air is 332 m/s
In which one of the following locations can a person hear the echo of a sound?
A. Less than 16.6 meters in front of the reflecting surface
B. At least 33.2 meters behind the reflecting surface
C. At least 16.6 meters in front of the reflecting surface
D. Less than 33.2 meters behind the reflecting surface
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