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Lect_33_note - Chapter 40-42 Introduction to Quantum...

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Chapter 40-42 Introduction to Quantum Physics
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Max Planck 1858 – 1947 German z Introduced the concept of “quantum of action” z In 1918 he was awarded the Nobel Prize for the discovery of the quantized nature of energy
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Quantum Revolution z Between 1900 and 1930, another revolution took place in physics z A new theory called quantum mechanics was successful in explaining the behavior of particles of microscopic size
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Photoelectric Effect z The photoelectric effect occurs when light incident on certain metallic surfaces causes electrons to be emitted from those surfaces
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Photoelectric Effect Classical Explanation z Light ( EM wave) energy is transferred to the metal, raising its temperature. z Electrons in the metal are emitted due to thermally activation.
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Energy Density of EM waves z The total instantaneous energy density is u =u E + u B = ε o E 2 = B 2 / μ o z The average intensity is 22 max avg 222 ooo EB E c B IS μμ c μ == = = u
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Photoelectric Effect Classical Prediction I k=½mv 2 z As the light intensity incident on the metal is increased, z the electrons should be ejected with more kinetic energy
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Photoelectric Effect Classical Prediction z There should be no relationship between the frequency of the light and the electric kinetic energy z Electrons should be ejected at any frequency as long as the light intensity is high enough. f k=½mv 2 22 max avg 222 ooo EB E c B IS μμ c μ == = = u
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Photoelectric Effect Classical Prediction z Electrons should be ejected at any frequency as long as the light intensity is high enough.
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_33_note - Chapter 40-42 Introduction to Quantum...

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