Question

(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).

Answer 1

Answer:

(a)Sonar is a way of communicating, navigating, and detecting objects by using sound propagation.

Sonar is used by submarines to detect if any obstacle is there ahead.

(b)As we know, d=v×t/2

therefore, d=1440×3/2=2160m