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For an echo to happen, what is the time interval between the original sound and the reflected sound received by the listener?

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1 s

0.1 s

0.5 s

10 s

answer is B.

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Detailed Solution

The time interval between the original sound and the reflected sound received by the listener is

0.1 s

.
An echo is the reflection of a sound that is heard by a person after a short delay after the original sound is heard. For an echo to occur, the time interval between the original sound and the reflected sound received by the listener is

0.1 s

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