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27-4 Photon Interactions; Compton Effect and Pair Production

27-4 Photon Interactions; Compton Effect and Pair Production. *A.H. Compton scattered (reflected) light from surfaces and found the scattered light had slightly lower frequency than the original light. *This is called the Compton effect.

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27-4 Photon Interactions; Compton Effect and Pair Production

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  1. 27-4 Photon Interactions; Compton Effect and Pair Production *A.H. Compton scattered (reflected) light from surfaces and found the scattered light had slightly lower frequency than the original light. *This is called the Compton effect. *This supported photon theory because of the photoelectric effect. See formulas p 833 *See Example 27-7 and photon interactions p 834

  2. 27-5 Wave Particle Duality * The principle of complementarity says to understand any given experiment, you must use either wave or particle theory, but the two must complement one another.

  3. 27-6 Wave Nature of Matter • Louis de Broglie took the wave debate to another level when he stated that all matter has wave behavior. • l=h/mv • See example 27-9 and 27-10

  4. 27-7 Electron Microscopes • Electron microscope • Transmission electron microscope • Scanning electron microscope • Scanning tunneling electron microscope • Atomic force microscope

  5. 27-8 Early Models of the Atom • Atomists- basic building block was invisible • Dalton’s Atomic Theory- indivisible atom • JJ Thomson- electron • Goldstein- proton • Chadwick -1932-Neutron • Niels Bohr- • Quantum Mechanical Model

  6. 27-9 Atomic Spectra-Key to atomic structure • Atomic absorption spectra • Atomic emission spectra • See page 842 • Balmer Series w/l = about 365 nm • Lyman series w/l = 91-122 nm

  7. 27-10 The Bohr Model • Quantum • Quantum or energy level number • Bohr Radius (see p 845) • Ground state/ excited state • The minimum energy to remove an electron from a gaseous atom is binding energy or ionization energy. • See Examples 27 11-14 p849

  8. 27-11 de Broglies Hypothesis Applied to atoms • See diagrams p 851

  9. HW TXT27B • Page 85 36-38,46,48-50 due Tuesday BOP

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