Sound Waves Video Lessons

Concept

# Problem: 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 surfaceB. At least 33.2 meters behind the reflecting surfaceC. At least 16.6 meters in front of the reflecting surfaceD. Less than 33.2 meters behind the reflecting surface

###### FREE Expert Solution

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

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###### Problem Details

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