(a) Microwaves are suitable for radar system that is used in aircraft navigation. These rays are produced by special vacuum tubes, namely- klystrons, magnetrons and Gunn diodes.
(b) Infrared waves are used to treat muscular strain. These rays are produced by hot bodies and molecules.
(c) X-rays are used as a diagnostic tool in medicine. These rays are produced when high energy electrons are stopped suddenly on a metal of high atomic number.
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