195- In radar, which waves are used to detect aircraft or ships? (1) Gamma rays (2) Ultraviolet rays (3) Infrared waves (4) Radio waves
\textbf{195-} In radar, which waves are used to detect aircraft or ships?
(1) Gamma rays \hfill (2) Ultraviolet rays \hfill (3) Infrared waves \hfill (4) Radio waves
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