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Energy of a Photon

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The energy of a photon is given by hc/λ, where h is Planck's constant, c is the speed of light, and λ is the photon wavelength in a vacuum.

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Visible light wavelengths are usually expressed in nanometers (nm), and give photon energies that are given in electronvolts (eV) or kJ/mol. Infrared radiation is measured in microns, and microwave radiation in cm. Radio waves are even longer, while ultraviolet wavelengths are even shorter than those of visible light.