A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate object under water. In a submarine equaipped with as SONAR, the time delay between genration of a probe wave and the recption of its echo after refection 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 ms^(-1)`

Explanation

`v=1450ms^(-1)`
`d=(vt)/(2)= (1450ms^(-1)xx77.0s)/(2)`
`=55810m= 55.8km`.