Answering Exams

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

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

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

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