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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 ν • h = “Planck’s Constant”= 6.626 x 10 –34 J s Planck’s Equation Energy, E = h υ = hc / λ – E is the energy of a single photon – c = 3.00 x 10 8 m/sec – h, Planck’s constant = 6.63 x 1034 joule sec – Joule is a unit of energy • Energy is directly proportional to υ (frequency) and inversely proportional to λ (wavelength) • As ↓ , ↑ , E ↑ • As ↑ , ↓ , E ↓ Electromagnetic Spectrum Energy (J) The Energy and Frequency of Quanta Radiation λ ν 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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 Fall '08
 BRANT
 Chemistry, Energy, Photon, Light, Light Electromagnetic Radiation

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