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# week9recisolved - Chem 109 Energy and Light Song of the...

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Chem 109 Energy and Light Song of the Week: Moonlight Sonata – Ludwig von Beethoven Equations of Interest: E = h ν c = λν E = hc/ λ People of Interest: Planck Einstein Bohr De Broglie Schrödinger Heisenberg The light blue glow given off by mercury street lamps has a wavelength of 436 nm. What is its frequency? c = λν ν = c / λ = 3.00 x 10 8 m/s / 436 x 10 -9 m = 6.88 x 10 14 Hz What is the energy in kJ of 1 mole of photos of FM radio waves with ν = 109.0 MHz? E = h ν = (6.626 x 10 -34 J s)(109.0 x 10 6 Hz) = 7.22 x 10 -26 J for one photon! 6.79 x 10 -26 J = 6.79 x 10 -29 kJ x 6.022 x 10 23 /mol = 4.35 x 10 -5 kJ/mol What is the de Broglie wavelength in meters of a pitched baseball with a mass of 120 g and a speed of 100 mph (44.7 m/s)? λ = h/mv note: h = 6.626 x 10 -34 J s = 6.626 x 10 -34 kg m 2 / s λ = 6.626 x 10 -34 kg m 2 / s / (0.120 kg)(44.7 m/s) = 1.24 x 10 -34 m Calculate the energies of the n =1 and n =2 states of the hydrogen atom in kilojoules per mole. E

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## This note was uploaded on 04/12/2008 for the course CHEM 109 taught by Professor Malina during the Spring '08 term at UNL.

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week9recisolved - Chem 109 Energy and Light Song of the...

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