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userdata-paziras-Chem101-Chap_07A

# 097x107 2 n 1 1 m 1 2 n2 wheren1 andn2 areintegers n2

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Unformatted text preview: sio n spectrum of Hydrogen. · This equat ion is known as RYDBERG’S EQUATION: 1 1 1 7 ¾ = 1.097 x10 ( ¾ - ¾ ) m -1 2 2 l 2 n 1 ¾ = 0.25 2 2 n = an integer greater than 2 n = 3 l = 6.56 x 10 7 m = 656 nm Red Line n = 4 l = 4.86 x 10 7 m = 486 nm Blue­Green Line n = 5 l = 4.34 x 10 7 m = 434 nm Blue Line n = 6 l = 4.10 x 10 7 m = 410 nm Violet Line · Later Rydberg generalized his equation to include the wavelengths o f those spectral lines whose wavelengths are not in the range of visible light. GENERALIZED RYDBERG EQUATION: 1 1 = 1.097 x 107 ( 2 λ n 1 1 ) m 1 2 n 2 where: n1 and n2 are integers n2 > n1 Rydberg did not provide an actual explanation of the line spectra 7 Chemistry 101 Chapter 7 PLANCK’S QUANTIZATION OF ENERGY · Planck’s theory is based on experimental observat ions. Background: · THE LIGHT GIVEN OFF BY A HOT SOLID VARIES WITH TEMPERATURE At lower temperatures (750 °C) ­ red light is emitted (a heated solid glows red) At higher temperatures (1200 °C) ­ yellow and blue light is also emitted and mixes wit h the red light (the heated solid glows white) Planck’s Explanation: 1. The atoms of the so lid vibrate with a specific frequency which depends on the: ­ type of so lid, and ­ temperature of the solid 2. An atom could have only certain energies o f vibrat ion: where: E = nhn E = energy n = an integer, called quantum number (can be 1, 2, 3…) n = frequency of vibrat ion h = Planck’s constant = 6.63 x 10-34...
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