27-4 Photon Interactions; Compton Effect and Pair Production *A.H. Compton scattered (reflected) light from surfaces and found the scattered light had.

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Presentation transcript:

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

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.

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

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

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 Neutron Niels Bohr- Quantum Mechanical Model

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 = nm

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 p849

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

HW TXT27B Page ,46,48-50 due Tuesday BOP