Electromagnetic spectrum

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Legend:

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γ = Gamma rays

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HX = Hard X-rays

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SX = Soft X-Rays

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EUV = Extreme ultraviolet

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NUV = Near ultraviolet

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Visible light

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NIR = Near infrared

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MIR = Moderate infrared

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FIR = Far infrared

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Radio waves:

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EHF = Extremely high frequency (Microwaves)

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SHF = Super high frequency (Microwaves)

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UHF = Ultrahigh frequency

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VHF = Very high frequency

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HF = High frequency

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MF = Medium frequency

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LF = Low frequency

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VLF = Very low frequency

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VF = Voice frequency

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ELF = Extremely low frequency

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The electromagnetic spectrum is the range of all possible electromagnetic radiation. Also, the "electromagnetic spectrum" (usually just spectrum) of an object is the range of electromagnetic radiation that it emits, reflects, or transmits.

Related Topics:
Electromagnetic radiation - Emits - Reflects

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The electromagnetic spectrum, shown in the table, extends from frequencies used in the electric power grid (at the long-wavelength end) to gamma radiation (at the short-wavelength end), covering wavelengths from thousands of kilometres down to fractions of the size of an atom.

Related Topics:
Kilometre - Atom

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Electromagnetic energy at a particular wavelength λ (in vacuum) has an associated frequency ν and photon energy E. Thus, the electromagnetic spectrum may be expressed equally well in terms of any of these three quantities. They are related according to the equations:

Related Topics:
Wavelength - λ - Frequency - ν - Photon - Energy

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:lambda = rac{c}{ u} ,!

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and

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:E=h u ,!

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where:

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• c is the speed of light, 299792458 m/s .
• h is Planck's constant, .
 
Electromagnetic spectrum: Spectra of objects ►