InterviewSolution
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InterviewSolution
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Why is an echo not heard when distance between the source of sound and reflection body is less than 10m? |
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Answer» The impression of sound lasts on the eardrum for 1/10 of a second the second sound travels a distance 332(m/s) x 1/10s = 33.2m. Thus, the minimum distance between the source of sound and the reflecting body should be 33.2/2 = 16.6m. As the distance 10m is far less than 16.6m, therefore the ear cannot make out when the original sound had died and echo has been received. Thus, no echo is heard. |
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