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Gamma ray is a stream of high-energy electromagnetic radiation given off by an atomic nucleus undergoing radioactive decay. Because the wavelengths of gamma rays are shorter than those of x-rays, gamma rays have greater energy and penetrating power than x-rays.

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A relatively high-energy photon with wavelength in the approximate range from 0.01 to 10 manometers. (Also called roentgen ray)

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Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the electromagnetic spectrum. Radiated energy, or radiation, is given off by many objects.

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

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The definition of infrared is light rays which are longer than light but shorter than radio waves.

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electromagnetic wave with a frequency in the range of 100 megahertz to 30 gigahertz (lower than infrared but higher than other radio waves).

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Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.

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In physics, Frequency is the number of crests of a wave that move past a given point in a given unit of time. The most common unit of frequency is the hertz.

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Light is measured by its wavelength, one wavelength equals the distance between two successive wave crests or troughs.

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Mechanical longitudinal waves are also called compressional waves or compression waves, because they produce compression and rarefaction when traveling through a medium.

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A wave that oscillates perpendicular to the axis along which the wave travels. Electromagnetic waves are transverse waves, since the electric and magnetic fields oscillate at a right angle to the direction of motion.

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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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A disturbance that travels through space and matter transferring energy from one place to another.