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Chapt25_VG

# Chapt25_VG - Chapter 25 Modern Optics and Matter Waves This...

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Unformatted text preview: Chapter 25. Modern Optics and Matter Waves This image of the individual atoms in a silicon crystal was made by exploiting the wave properties of electrons. Sometimes, electrons act less like particles and more like traveling waves. This is an important result of quantum physics . Quantum Mechanics: Basic Idea Sometimes particles of matter behave as if they were some kind of wave. Sometimes electromagnetic waves (light) behave as if they were composed of particles (photons) In both cases an element of probability is introduced. We can no longer say what will happen in a set of circumstances, rather we can say what are the probabilities of various things happening. Classical Physics Newton’s laws of motion + Maxwell’s equations Basically this is what you have learned so far and it does a good job explaining many things. Things it can not explain: Discrete spectra of atoms Existence of atoms Photo-electric effect (photons) Diffraction of electrons Classical physics was thought to describe the interaction of light with charges until there were discovered too many things that it could not explain. Classical Physics ! E ⋅ d ! A " ∫ = Q in ε ! B ⋅ d ! A " ∫ = ! B ( ! r ) ⋅ d ! s = " ∫ μ ( I through + ε d dt ! E ⋅ d ! A ) surface ∫ loop ! E ⋅ d ! S " ∫ == − d dt ! B ⋅ d ! A Surface ∫ Maxwell’s Equations m d dt ! v i = q ! E + ! v i × ! B ( ) d dt ! x i = ! v i Q in = q i i ∑ I through ! L = q i i ∑ ! v i Newton’s Laws E, B Q in , I thr Classical Physics Newton’s laws of motion + Maxwell’s equations Basically this is what you have learned so far and it does a good job explaining many things. Things it can not explain: Discrete spectra of atoms Existence of atoms Photo-electric effect (photons) Diffraction of electrons Classical physics was thought to describe the interaction of light with charges until there were discovered too many things that it could not explain. Discrete spectra of atoms - pass light through a diffraction grating The Spectrum of Hydrogen...
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Chapt25_VG - Chapter 25 Modern Optics and Matter Waves This...

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