Question

A rock under water is 2900 m deep. Calculate the time in which an ultrasonic signal will return after reflection from the rock. Take velocity of ultrasonic waves in water = 1.45 km//s.

Answer 1

`Here, x = 2900m, upsilon =1.45 km//s = 1450m//s t =?`
As ` x = (upsilonxxt)/(2) :. t= (2x)/(upsilon) = (2xx2900)/(1450) = 4s`