A child hears an echo from a cliff `4 s` after the sound of a powerful cracker is produced. How far away is the cliff from the child ? (Take speed in air as `340 m//s`) ?

Read the given passage and select the correct option for the following questions. The sound returning back towards the source after suffering reflection from a distant obstacle like wall, hill etc. is called an echo. A cracker is fired by a child. The child hears an echo from a cliff 4 seconds after the sound produced by a cracker. The speed of sound in air at 20^(@)C is 344 ms^(-1) . How far is the cliff from the child?

Read the given passage and select the correct option for the following questions. The sound returning back towards the source after suffering reflection from a distant obstacle like wall, hill etc. is called an echo. A cracker is fired by a child. The child hears an echo from a cliff 4 seconds after the sound produced by a cracker. The speed of sound in air at 20^(@)C is 344 ms^(-1) . What is the minimum distance between the observer and the obstacle for echo to be heard?

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

A person clapped his hands near a cliff and heard the echo after 5 s . What is the distance of the cliff from the person if the speed of the sound, v is taken as 346 m//s ?

A man fires a shot and hears an echo from a cliff after 2 s . He walks 85 m towards the cliff and the echo of a second shot is now heard after 1.4 s . What is the velocity of sound and how far was the man from the cliff when he first heard the echo ?