Lecture_notes-Chapter_28

Lecture_notes-Chapter_28 - Chapter 28: Modern Physics...

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Unformatted text preview: Chapter 28: Modern Physics Outline ---1. Black body irradiation and Plank's theory: --- 1) black body: a body that absorb all radiations with nothing reflected back. --- 2) black body irradiation:. I = T 4 , peakT = b, = 5.67 10 -8 W / m 2 K 4 , b = 2.898 10 -3 m K , --- 3) Plank theory: the radiation energy E is quantized (discrete, NOT consecutive), E = nE0 , E0 = hf , h = 6.626 10 -34 J s, 2hc 2 -5 I ( , T ) = hc / k B T , e 2. Photoelectric effect: 3. 4. Wave nature of matter: de Broglie wave -- E = hf , = h . m 5. Bohr atom: h = E - E , u L me rn = n h nh, 2 electrons are emitted from a metal surface when light shines on it. a) Photon particles as light, b) Einstein's equation ---- 1 (me ---mass of the electron, 2 me m = h - W0 , W0 --- called work function) 2 Compton effect: light wavelength increases after scattering by a metal. h = 0 + (1 - cos ), (me --- mass of a electron, 0 = incident light wavelength) me c *6. uncertainty principle, wave function and Schrodinger equation h 2 d 2 xp h, - + U = E . 2m dx 2 7. Ability to solve real problems -- mainly conceptual understanding in this chapter. ...
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This note was uploaded on 07/13/2008 for the course PHYS 6C taught by Professor Staff during the Spring '01 term at UCLA.

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