Question

A person stands 170 m away from a cliff wall He bangs a drum and hears the echo of the drum 1 second later what is the speed of sound in air?

Answer 1

Answer:

Distance = 170 m

Time after which echo is heard = 1 s

Time taken by the sound to reach the cliff wall = $\frac{1}{2}$ s

= 0.5 s

Speed of the sound = $\frac{Distance}{Time}$

= $\frac{170}{0.5}$

= 340 $m s^{-1}$

∴ The speed of sound in air is 340 $m s^{-1}$.