Electromagnetic waves are produced by the motion of electrically charged particles. These waves are also called “electromagnetic radiation” because they radiate from the electrically charged particles. They travel through air, empty space and other substances.
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The electromagnetic radiation travels at c = 3 x 108 m/s in vacuum.
Examples of Electromagnetic Radiation:
AM and FM radio waves, TV signals, cell phone communication links, microwaves, infrared radiation, light, X-rays, Gamma rays.
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Uses of Electromagnetic Waves:
(i) One-way and two-way communication systems
(ii) Radar
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(iii) Cooking (with microwaves)
(iv) Medical imaging (X rays)
(v) Night vision (infrared), and
(vi) Astronomy (radio, gamma, UV, visible, IR, microwave)
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All that we experience through our eyes is conveyed by electromagnetic radiation.