The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use ?

(A) red waves (X)
(B) Infrared waves (X)
(C) Ultrasonic ()
(D) super sonic (X)
(E) None of these (X)

Answers: The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use  Ultrasonic