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Four-part infographic illustrating the relationship between the wavelength (color) of light absorbed by an electron, the change in energy level of the electron,

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Light is an electromagnetic wave that carries energy across space. The Energy per unit area and unit time is defined as intensity which is directly proportional to the square of the amplitude of the electric field of the light wave. This energy is not continuous but arrives in discrete units called photons. Photons are the particles of light. Â

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We shall say that linearly polarized or plane-polarized light is in a P-state, and right- or left-circular light is in an R- or L-state, respectively.

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A photon is described by either λ  which is the wavelength, or by E which is the Energy. The relationship between the energy of a photon (E) and the wavelength of the light (λ) is an inverse relationship and is described by the following by the equation: E=hcλE=hcλ where h is Planck's constant and c is the speed of light. h = 6.626 × 10 -34 joule·sc = 2.998 × 108 m/s By multiplying to get a single expression, hc = 1.99 × 10-25 joules-m The above inverse relationship means that light consisting of high energy photons has a short wavelength. Light consisting of low energy photons has a long wavelength. eV ( Electron –volt) is the unit of energy commonly used when dealing the particles rather than joule (J). An electron volt is the energy required to move an electron through 1 volt, thus the energy of 1 eV for a photon is 1.602 × 10-19 J. So the above equation can be written by expressing constant for hc in terms of eV: hc = (1.99 × 10-25 joules-m) × (1ev/1.602 × 10-19 joules) = 1.24 × 10-6  eV-mFurther, the units should µm (the units for λ):hc = (1.24 × 10-6 eV-m) × (106 µm/ m) = 1.24 eV-µm By expressing the equation for photon energy in terms of eV and µm the energy and wavelength of a photon can be related, as shown in the following equation: E(eV)=1.24λ(μm)EeV=1.24λμm The exact value of 1 × 106(hc/q) is 1.2398 but the approximation 1.24 is sufficient for most purposes.