Lecture 7

Lecture 7 - CHM 115-T Lecture 7 9-18-08 1 Reading Expected...

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1 CHM 115-T Lecture 7 9-18-08
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2 Reading Expected for Today Chapter 7, pp 294-312, 318-323
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3 Question #1 Which light wave is of highest energy?
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4 Think/Pair/Share Question #2 Which light wave is brightest?
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5 c = λ ν c = velocity Key terms: wavelength, λ (nm) frequency, ν (s -1 = Hz) The speed of light is a constant in vacuum equal to 3.00 x 10 8 m/s. λ Α
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6 Amplitude (intensity) of a wave Key terms: wavelength amplitude
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7 Image of the Atom Nucleus (positive charge) Electrons, e (negative charge)
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8 Atomic Line Spectra It has been known since the 1800’s that line spectra exist. The spectrum for each element is unique! http://www.jce.divched.org/JCEDLib/WebWare
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9 What causes the emitted lines? Scientists have proposed that these spectral lines are caused by a process in the atom that involves electrons. How do we know these lines are caused by electronic processes and not a nuclear process? Figure 7.3 - gamma ray energies vs. E’s for visible light. Gamma ray photons are emitted by nuclear processes.
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10 Emitted Photons Factor of 10,000 to 100,000 difference in energy! from nuclear decay visible photons
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Electrons? What do the different energies of the lines tell us about the characteristics of the electrons? One way to approach this is to look at the data (the line spectra) and see if the data can be described by an equation (mathematics). The H spectrum
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Lecture 7 - CHM 115-T Lecture 7 9-18-08 1 Reading Expected...

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