Electromagnetic Radiation Concepts

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Electromagnetic radiation

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The radiation associated with an electric and magnetic field.

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Electromagnetic spectrum

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All of the frequencies or wavelengths of electromagnetic radiation.

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Wavelength

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The distance from any point on a wave to an identical point on the next wave.

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Frequency

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The number of cycles or vibrations per unit of time.

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Photoelectric effect

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The emission of electrons from a material when light of certain frequencies shines on the surface of the material.

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Quantum

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The basic unit of electromagnetic energy.

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Photon

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A unit or quantum of light.

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Ground state

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The lowest energy state of a quantized system.

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Excited state

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A state in which an atom has more energy than it does in its ground state.

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Line-emission spectrum

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A diagram or graph that indicates the degree of which a substance emits radiant energy with respect to wavelength.