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Unformatted text preview: In the early 20th century, several discoveries led to a particle model of light. Photons: particles of light Energy of a photon: E = h h = Plancks Constant= 6.626 x 10 34 J s Plancks Equation Energy, E = h = hc / E is the energy of a single photon c = 3.00 x 10 8 m/sec h, Plancks constant = 6.63 x 1034 joule sec Joule is a unit of energy Energy is directly proportional to (frequency) and inversely proportional to (wavelength) As , , E As , , E Electromagnetic Spectrum Energy (J) The Energy and Frequency of Quanta Radiation E Photon E mol (m) (s1 ) (J) (kJ/mol) Radio Wave 10 3.0x 10 7 2.0 x 1026 1.2x10522 303 21 Photon Energy A laser emits red light with wavelength of 630 nm (1 nm = 10 9 m) What is the energy of a photon at this Wavelength?...
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This note was uploaded on 08/29/2010 for the course CHM 2045 taught by Professor Brant during the Fall '08 term at University of South Florida  Tampa.
 Fall '08
 BRANT
 Chemistry

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