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The amount of energy is inversely related to the wavelength of the radiation: the shorter the wavelength, the greater the energy of each photon.

This was originally discovered by Max Planck who identified a co-effiecient of proportionality that related a photon's energy to its frequency. This co-effiecient is known as the Planck constant and allows the energy of a photon to be found using the following relation (known as the Planck relation or the Planck-Einstein equation):

E = hv (Eq. 1)

Where:

E = Energy (J)

h = Planck constant (6.62606896×10−34 Js)

v = frequency (Hz).

For electromagnetic radiation travelling through a vacuum:

v = c / λ(Eq. 2)

Where:

c = speed of light in a vacuum

λ = wavelength (m)

As such this can be substituted into the Planck relation to give the following: E = hc / λ(Eq. 3)

From equations 1 and 3 it can be seen that a photon's energy is directly proportional to it's frequency and inversely proportional to its wavelength.

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Edwin Mitchell

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