Question

A man is standing 30m away from a larger wall and call his friend and hears an echo. Calculate after what time does he hear an echo ?(speed of the sound in air =330m/s

Answer 1

As we know that :

"Speed is defined by the Changing in 1 meter distance per second."

SI unit of speed = m/sec

From the definition : speed = distance/time

=> Time = distance/speed

Given that : speed of air = 330m/sec and distance = 30m

Now, according to the question :

Time = 30/330 = 1/11 sec

It mean after 1/11 sec he hear an echo.

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