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In which one of the following locations can a person hear the echo of a sound?A. At least 33.2 meters behind the reflecting surface

BAt least 16.6 meters in front of the reflecting surface
CLess than 33.2 meters behind the reflecting surface
DLess than 16.6 meters in front of the reflecting surface

Verified Answer :

Kalahira

The location in which a person is more likely to receive an echo of the soud being sent is at least 16.6. meters in front of the reflecting surface. Therefore, the answer is to this item is letter A. The speed of sound without any interference is only about 340 m/s traveling through the vibration of the media in which it passes through.

gradman555p98x9p

The right answer is B. At least 16.6 meters in front...

The sound moves in the air at 340 m / s, and the ear can only hear the echo if it returns at least 1 / 10th after its emission, a distance of at least 16.6 meters (or 17 meters) with reflective surface.

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