What is the minimum distance required for a distinct echo to be heard, assuming the speed of sound is 340m/s?

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A 17 m
B 34 m
C 10 m
D 50 m

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Answer: A. 17 m

For an echo, sound must travel to the object and back, a total of 34 meters (17m there and 17m back). The human ear needs a delay of at least 0.1 seconds to distinguish the sound.

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What is the minimum distance required for a distinct echo to be heard, assuming the speed of sound is 340m/s?

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