Answer:
Radar technology played a significant part in World War II and was of such importance that some historians have claimed that radar helped the Allies win the war more than any other piece of technology, including the atomic bomb.
Sonar on a submarine is very similar. The sub sends out a sound—a ping—which bounces off a nearby object in the ocean and creates an echo that returns to the boat. World War II submarines could stay underwater for up to two days. During that time, sonar operators were hard at work.
Step-by-step explanation:
Radar was originally developed to detect enemy aircraft during World War II, but it is now widely used in everything from police speed-detector guns to weather forecasting.
Sonar is also used in acoustic homing torpedoes, in acoustic mines, and in mine detection. Nonmilitary uses of sonar include fish finding, depth sounding, mapping of the sea bottom, Doppler navigation, and acoustic locating for divers.