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Penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei.

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n electromagnetic wave of high energy and very short wavelength, which is able to pass through many materials opaque to light.

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Of electromagnetic radiation having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays.

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Visible light is a form of electromagnetic (EM) radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves.

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Of electromagnetic radiation having a wavelength just greater than that of the red end of the visible light spectrum but less than that of microwaves. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects.

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An electromagnetic wave with a wavelength in the range 0.001–0.3 m, shorter than that of a normal radio wave but longer than those of infrared radiation. Microwaves are used in radar, in communications, and for heating in microwave ovens and in various industrial processes.

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An electromagnetic wave of a frequency between about 104 and 1011 or 1012 Hz, as used for long-distance communication.

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The rate at which something occurs or is repeated over a particular period of time or in a given sample.

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The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.

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A wave vibrating in the direction of propagation.

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A wave vibrating at right angles to the direction of its propagation.

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A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.

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Wave is an oscillation accompanied by a transfer of energy that travels through a medium (space or mass).

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Electromagnetic waves are waves which can travel through the vacuum of outer space.