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Unformatted text preview: emits a photon that has a wavelength of 486 nm. What is the nal state of the hydrogen atom? 4. Calculate the de Broglie wavelength for a) an electron with kinetic energy 100 eV, b) a proton with kinetic energy 100 eV, and c) an electron in the rst Bohr orbit of a hydrogen atom. 5. What speed does an O 2 molecule have if it has the same momentum as a photon of wavelength a) 190 nm? b) 0.2 nm? Compare the results with the average speed of an O 2 molecule at T= 300 K, calculated from the rms velocity v rms = p 3 kT / m and comment on the implications of your result for whether quantum effects are important in the translations of molecules at room temperature. Chem 120A, Fall 2010 1...
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- Fall '10