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Quantum Theory of Atom Notes

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ELECTRONS. The “Planetary” model of the atom has electrons “orbiting” around the nucleus in specific “orbits” or Energy levels. If an electron undergoes a transition from a high to a lower level, light is emitted with energy equal to the difference in the energies of the two energy levels. Part 1. Bohr’s Planetary Model + n=1 , n=2 n=3 n=4 The transition is represented as an arrow. The energy of the emitted light is inversely proportional to its wavelength () or directly proportional to its frequency () Since c =  x  we can say c = 3.00 x 108 m/sec and h is Planck’s constant = 6.63 x 10-34 J sec.  = h or  = hc /   has the unit = sec-1 (also called “Hertz” or Hz) and  has the unit = meters.  is usually expressed in nm (10-9m) or Å (Ångström = 10-10 m). Exercises with solution: 1). The energy of a photon of light is __________ proportional to its frequency and __________ proportional to its wavelength. A) directly, directly B) inversely, inversely C) inversely, directly D) directly, inversely E) indirectly, not 2). Of the following transitions in the Bohr hydrogen atom, the __________ transition results in the emission of the low wavelength photon. A) n = 1 → n = 6 B) n = 6 → n = 1 C) n = 6 → n = 3 D) n = 3 → n = 6 E) n = 1 → n = 4 Key: 1). The energy of a photon of light is __________ proportional to its frequency and __________ proportional to its wavelength. Answer = D A) directly ...
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