The speed of sound in water is 1500 metres per second. How far away from an under-sea rock should a deep sea dilver be so that he can hear his own echo?

The speed of sound in water is 1500 m/s. A boat man hears an echo 3 s after sending a sound pulse into the sea. What is the depth of the sea?

The speed of sound in water is 1600 m/s. A boat man hears an echo 3 s after sending an ultrasonic sound into the sea. What is the depth of the sea?

A person standing between two vertical cliffs and 640 m away from the nearest cliff, produces sound. He hears the first echo after 4 s and the second echo 3 s later. Calculate : the speed of sound in air,

A person standing between two vertical cliffs and 640 m away from the nearest cliff, produces sound. He hears the first echo after 4 s and the second echo 3 s later. Calculate : the distance between the cliffs

A man standing at some distance from a cliff hears the echo of sound after 2s. He walks 495 m away from the cliff. He produces a sound there and receives the echo after 5s. What is the speed of sound?

A person standing between two vertical cliffs and 680 m away from the nearst cliff, shouted. He heard the first echo after 4 s and the second echo 3 s later. Calculate (a) the speed of sound in air and (b) distance between the two cliffs.