ch27notes - Chapter 27 Notes College Physics by...

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Chapter 27 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Quantum Physics Three famous experiments at the end of the 19 th Century required a new theory of matter and radiation in order to explain the results: Blackbody radiation Photoelectric effect Compton scattering Photoelectric Effect basis of modern-day solar cell technology Experimental Results: 1) Brighter light yields more electrons but with the same maximum KE. 2) No photoelectric current when f < f 0 . 3) Maximum KE depends on frequency of light: K max = h ( f – f 0 ). 4) Current happens immediately when f < f 0 . The maximum KE is given by K max = eV s where V s is the stopping potential , i.e. the voltage difference responsible for accelerating the electrons between the plates. Einstein 1905: Light consists of photons which must have a minimum amount of energy in order to release an electron from a metal surface. The energy of a photon is E photon = hf where h = 6.63×10 –34
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This note was uploaded on 12/01/2010 for the course PHYSICS 21900 taught by Professor Rhoads during the Spring '10 term at IUPUI.

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ch27notes - Chapter 27 Notes College Physics by...

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