SG_Chap27 - Chapter 27 Quantum Physics We now know that the...

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1 Chapter 27 Quantum Physics We now know that the world is different at high speed At very small sizes the world is also VERY different! - Energy is discrete, not continuous. -“particles” and “waves” Problems that relativity didn’t explain: - Blackbody Radiation The electromagnetic radiation emitted by a heated object - Photoelectric Effect Emission of electrons by an illuminated metal - Spectral Lines Emission of sharp spectral lines by gas atoms in an electric discharge tube 27.1 Blackbody Radiation An object at any temperature emits electromagnetic radiation, called thermal radiation Opening in a cavity is a good approximation - blackbody - Experimental data for distribution of energy - As the temperature increases, the total amount of energy increases - As the temperature increases, the peak of the distribution shifts to shorter wavelengths The wavelength of the peak of the blackbody distribution was found to follow Wein’s Displacement Law λ max T = 0.2898 x 10 -2 m • K Example The human eye is sensitive to 560 nm (green) light. What is the
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This note was uploaded on 09/13/2009 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.

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SG_Chap27 - Chapter 27 Quantum Physics We now know that the...

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