Quiz1_DB-key - CHMU 403 PhysChem 2 Quiz 1 KEY Name. Sept...

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Sept 18, 2008 Quiz 1 KEY Name………………………………………. . 1. Calculate frequency, wavenumber (in cm -1 ), energy (in J), and momentum for a photon with λ = 3 μ m (c = 3 10 8 m/s, h = 6.6 10 -34 Js) Frequency [Hz] ν = c/ λ = 3 10 8 / (3 10 -6 ) [m s -1 / m] = 10 14 Hz Wavenumber [cm -1 ] ν = 1/ λ = 1/(3 10 -4 ) [1/cm] = 3300 cm -1 Energy [J] E = h ν = 6.6 10 -34 10 14 [Js s -1 ] = 6.6 10 -20 J Momentum p = h/ λ = 6.6 10 -34 / 3 10 -6 [kg m 2 s -1 / m = kg m / s] = 2.2 10 -28 kg m / s 2. How did the observation of the line spectrum of the H atom help usher in the concepts of quantum mechanics? The hydrogen atom (line) spectrum demonstrated that the electrons in an atomic system can have discrete energy values only, whereas classical macroscopic systems can have arbitrary kinetic energy. Thus, a theoretical framework needed to be devised in which kinetic energy is quantized. 1
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Quiz1_DB-key - CHMU 403 PhysChem 2 Quiz 1 KEY Name. Sept...

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