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Lecture 16 10_03_08 - Announcements Exam 1 Wednesday...

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Announcements Exam 1 Wednesday October 15 at 2PM on Chapters 4, 5 and 6 Homework on Chapter 6 due October 15
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Photoelectric Effect Particulate Nature of Light Shine light on metal (cathode) Electrons emitted Detect number of electrons and kinetic energies Current flow used to monitor light intensity.
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Photoelectric Effect
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Photoelectric Effect Binding Energy - energy holding an electron to a metal. Threshold frequency, ν o - minimum frequency of light needed to emit an electron. For frequencies below the threshold frequency, no electrons are emitted. For frequencies above the threshold frequency, extra energy is imparted to the electrons as kinetic energy. E photon = Binding Energy + Kinetic Energy
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Light with ν = 1.3 x 10 15 s –1 ejects electrons from cesium metal. If the kinetic energy of the electrons is 5.2 x 10 –19 J, what is the binding energy of electrons in cesium metal?
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Photoelectric Effect Experimental results NOT consistent with “wave model” of light. Results explained by “Particle model of light by Albert Einstein (1905) Particles of Light Individual bundles of energy: PHOTONS Massless Blackbody Radiation - Max Planck:
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