Question 54

If the speed of sound in air is 344 m/s at $$22^\circ$$ C, and the minimum time interval between sound and echo is 0.1 s for a distinct echo, what is the distance the sound should travel from source to reflecting surface and then back to ear?

Solution

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 total distance covered by the sound from the point of generation to the reflecting surface and back should be at least $$ (344 m/s) \times 0.1 s $$ = 34.4 m. Thus, for hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be half of this distance, that is, 17.2 m.

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