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Doppler radar is dependent on the radio waves that are reflected back by the water particles. The correct option among all the options that are given in the question is the last option. A Doppler radar is a specialized kind od radar that is used to calculate the distance of objects from a specific object. It emits radio waves and receives the incoming waves to calculate the distance.

Answer:

Radio waves

Explanation:

Doppler radar is dependent on the radio waves that are reflected back by water particles. The radar ejects a signal which travels and hits the moving target at some speed. The radar then receives the reflected signal and then compares the change in the frequency of the signal to determine the speed of the target.

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