(a) What is sonar? Explain its use.
(b) A sonar station picks up a return signal after 3 seconds. How far away is the object? (Speed of sound in water `= 1440 m//s)`.

If a thunder is heared by a man 4 seconds after the lightning is seen, how far is the lighting from the man? (Speed of sound in air = 330 m//s) .

A rock under water is 1595 m deep. Find the time in which an ultrasonic signal returns after reflection from the rock. Speed of ultrasonic waves in water = 1450m//s .

Two observers are stationed in two boats 4.5 km apart. A sound signal sent by one, under water, reaches the other after 3 seconds. What is the speed of sound in the water?

Two observers are stationed in two boats 4.5 km apart. A sound signal sent by one,under water, reaches the other after 3 seconds. What is the speed of sound in the water? Distance between two observers, d = 4 .54 km To find : speed of sound, V = d/t= ?

A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a SONAR the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine? (Speed of sound in water = 1450 m s^-1 ).

A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a SONAR the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine? (Speed of sound in water = 1450 m s^(-1) )