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# Quiz 4 Answers, 3-12-08 - Quiz 4 Write down the following...

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Quiz 4, March 12, 2008 E = h ν λν = c c = 3.0 × 10 8 m/s h = 6.63 × 10 -34 J·s (Planck) R = 2.18 × 10 -18 J (Rydberg) Write down the following information to use during the quiz = 2 1 n R E mv h = λ (de Broglie) v

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1 . Light is absorbed when an electron in the n = 1 level of an H atom moves into the n = 3 level. Following the absorption of light, the H-atom emits a photon and the electron moves to the n = 2 level. Which of the following statements is true? A. The net value of the internal energy change for the two steps is + answer B. The emitted light has a shorter wavelength than the absorbed light. C. Light cannot be emitted for the n = 3 to n = 2 transition of H atoms D. The frequency of the absorbed light is smaller than the frequency of the emitted light E. None of the above statements is true
2. The work function for Li ( s ) is 280 kJ/mol. When light composed of photons with a certain energy hits the surface of Li (s), the electrons leaving the surface have a kinetic energy of 29 kJ/mol. What is the energy of a mole of the photons used to irradiate Li (s)?

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Quiz 4 Answers, 3-12-08 - Quiz 4 Write down the following...

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