Understanding means seeing that the same thing said different ways is the same thing - Ludwig Wittgenstein

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The Origin and Nature of Light
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Blackbody- A perfect absorber of all wavelengths
of Electromagnetic radiation
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Wiens Law The dominant l from a Blackbody is
inversely proportional to its temperature
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Stefan-Boltzmann Law A blackbodys energy
output Is proportional to its Temperature to the
4th power
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Blackbody Curves
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lmax
Intensity
Wavelength
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Intensity
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The Structure of the Atom
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Fundamental components of the Atom
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Fundamental components of the Atom Nucleus
- Protons (positively charged) Neutrons
(electrically neutral)
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Fundamental components of the Atom Nucleus
- Protons (positively charged) Neutrons
(electrically neutral) Electrons (negatively
charged)
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The Hydrogen Atom
Electron
Proton
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The Helium Atom
Neutrons
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Electron energy levels are quantized
Ground state
orbitals
Excited states
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How does an electron gain energy?
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Electrons gain energy from
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Electrons gain energy from - collisions
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Electrons gain energy from - collisions -
electrical potentials
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Electrons gain energy from - collisions -
electrical potentials - absorbing photons
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Electron absorbs photon and becomes excited
Photon
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How does an electron lose energy?
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Electron emits photon and becomes de-excited
Photon
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Atomic Spectra - continuous spectra -
absorption spectra - emission spectra
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Kirchoffs Laws
Heated Blackbody Continuous Spectrum
Heated low density gas Emission Spectrum
Cool low density gas Absorption Spectrum
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The pattern of absorption/emission lines in the
spectrum is a function of which element is
present
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The pattern of absorption/emission lines in the
spectrum is a function of which element is
present line pattern -gt chemical composition
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The Doppler Effect
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The Doppler Effect gives velocity information
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