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LECTURE 02 quantization

LECTURE 02 quantization - LIGHT • Electromagnetic Energy...

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Dr. P. Lucas U of A MSE 110 LIGHT E = h υ υ =c/ λ h: Planck constant h = 6.626x10 -34 J.s Duality wave/particle of the light: two possible descriptions Electromagnetic Energy: Light
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Dr. P. Lucas U of A MSE 110 DUALITY WAVE/PARTICLE OF LIGHT Ligth as a wave : Electromagnetic wave : Electric and Magnetic field oscillating All the characteristics of a wave : wavelength amplitude phase (time dependence) velocity: c
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Dr. P. Lucas U of A MSE 110 Ligth as a particle : photons DUALITY WAVE/PARTICLE OF LIGHT Photons have no mass but : Have momentum p=h/ λ Carry quantized amount of energy (energy packet) E=h υ Can transfer energy through collisions
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Dr. P. Lucas U of A MSE 110 QUANTIZATION OF ENERGY Quantization of energy : energy can only be transferred in packets. Max Planck ’s idea. He developed the mathematical formalism (1900). But never truly believed in it. It was Einstein who demonstrated quantization 5 years later with the photoelectric effect. He demonstrated the particle nature of light: photon. It was the first step towards the development of quantum physics which describes the nature of atoms.
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Dr. P. Lucas U of A MSE 110 The current is proportional to the intensity of the light h ν 1 Einstein’s photoelectric effect QUANTIZATION OF ENERGY h ν Na cathode hit by light of energy E=h υ . Na Cathode and anode in vacuum tube. Cathode -, anode + - + Electrons are attracted by the positively charged anode and cause current to flow.
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