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| A
photon is a light quantum. The energy of the photon is associated with
the wavelength, l,
and velocity, c, of the light. E
= hc/l = hn,
where
n
is the frequency of the light and h
is Planck's constant.
Velocity of light in a vacuum = 3 x 108 m/s Planck's constant, h = 6.63 x 10-33 J-s. Wavelength of light with a photon energy of 1 eV -> 1239.6 nm Wavelength of a 6.5 eV photon -> 190.7 nm (Ultraviolet) Wavelength of a 2 eV photon -> 600 nm (Visible) Wavelength
of a 0.5 eV photon -> 2480 nm = 2.48 microns (Infrared)
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| Max Planck, Germany (1858 - 1947) | |||||||||||