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Physics

Explain how the speed of sound can be determined by the method of echo?

Sound

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Answer

The echo method can be used to determine the speed of sound in air.

For this, sound is produced from a place at a known distance say, d at least 50 m from the reflecting surface. The time interval t in which the echo reaches the place from where the sound was produced, is noted by a stop watch having the least count 0.01 s . Then the speed is calculated by using the following relation —

V = Total distance travelledTime interval\dfrac{\text {Total distance travelled}}{\text{Time interval}}

V = 2dt\dfrac{\text {2d}}{\text {t}} ms-1

The experiment is repeated several times and then the average value of speed of sound V is determined.

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