Unformatted text preview: The energy of one photon is E = hν = (6 . 626 × 1034 J s) × (880 × 10 3 s1 ) = 5 . 83 × 1028 J / photon Use this value to convert the stated power in watts (Joules/second) to photons/second: 10 3 J / s 5 . 83 × 1028 J / photon = 1 . 72 × 10 30 photons / s 2 –8 Under favorable circumstances the human eye can detect 1 . × 10 18 J of electromagnetic energy. How many 600 nm photons does this represent? It is simplest to get the photon energy Frst in Joules: E = hc λ = 1240 eV nm 600 nm = 2 . 07 eV = 2 . 07 eV × ( 1 . 602 × 1019 J / eV ) = 3 . 31 × 1019 J Now the number of photons is just 1 × 1018 J 3 . 31 × 1019 J ≈ 3 January 23, 2008...
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 Spring '07
 Hickman
 Energy, Kinetic Energy, Photon, Light, ev, photoelectrons

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