Echo ranging is the process of detecting underwater objects using sound signals. The minimum distance between source and the reflecting body should be 17 metres for the formation of an echo. This technique is used to measure depth of sea with the help of Sonar.
Q. A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compression from the source ?
Ans. Here, f = 500 Hz
The time interval between successive compression means the time period.
T =1/f =1/500 = 0.002 s