A man standing at `51 m` from a wall fires a gun. Calculate the time after which an echo is heard. The speed of sound is `340 m//s`.

A man standing 48 m away from a wall fires a gun. Calculate the time after which an echo is heard. (The speed of sound in air is 320 m s^(-1) ).

The minimum distance to hear echo (speed of sound in air is 340 m//s )

A person standing near a hill fires a gun and hears the echo after 1 second. If speed of sound in air is 340 m//s . Find the distance between the hill and the person.

An observer standing between two cliffs fires a gun. He hears one echo after 1.5 s and another after 3.5 s . If the speed of sound is 340 m//s , find. (a) the distance of the observer from the first cliff and. (b) distance between the cliffs.

A man standing 25 m away from a wall produces a sound and receives the reflected sound. Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m s^(-1) .

A man standing 25 m away from a wall produces a sound and receives the reflected sound. Calculate the time after which he receives the reflected sound if the speed of sound in air is 350ms^(-1) .

A man shouts loudly close to a high wall. He hears an echo. If the man is at 40 m from the wall, how long after the shout will the echo be heard? (speed of sound in air = 330 m//s )