Echo is whereby a sound is heard two or more times because of reflection from one or more surfaces.
The total distance between the listener and the reflected wave (echo) is d.
Total distance for the reflection to be heard is 2d
Speed of sound in the air is 332 m/s
The minimum interval of time between two sounds to be distinctly heard is t = 0.1 s.
In which one of the following locations can a person hear the echo of a sound?
A. Less than 33.2 meters behind the reflecting surface
B. Less than 16.6 meters in front of the reflecting surface
C. At least 16.6 meters in front of the reflecting surface
D. At least 33.2 meters behind the reflecting surface
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