Round 3: Tossup 15

In this technique, the Probert–Jones equation sets the backscattered power proportional to the reflectivity factor Z. (-5[1])Before it was used for diathermic heating, the cavity magnetron was developed for use in this technique. FM is often combined with the “continuous-wave” form of this technique, which predates a variant that measures the phase shift between pulses to observe features like hook echoes. The velocity (10[1])of water droplets can be measured via the Doppler effect in this technique, which is able to detect (10[1])supersonic V-2 rockets. The NWS uses this technique to track weather patterns. For 10 (10[1])points, name this technique that uses radio waves (10[1])to find the distance to an object. (10[2])■END■ (10[2])

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