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Unformatted text preview: hydrogen in a gas discharge tube. Why are all lines seen at once if hydrogen has only one electron? 5. Calculate the E, , and of a photon that is emitted from a hydrogen atom when an electron falls from n i = 2 to n f = 1. 6. A single photon has a wavelength of 450 nm. Calculate the energy in 1.5 moles of photons. 7. The kinetic energy of an electron ejected from a sheet of Mg by a beam of light is 8.1710-19 J. The frequency of the incident light is 2.12710 15 Hz. Determine the wavelength of the incident light and the work function of Mg. Conversion Factors and Constants 1 GHz = 1 x 10 3 MHz = 1 x 10 9 Hz electron mass = 9.11 x 10 -31 kg speed of light = c = 3.00 x 10 8 m/s Plancks constant = h = 6.6310-34 Js Rydberg constant = R H = 2.1810-18 J 1 J = 1 kgm 2 s-2...
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