Photons of Light

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Photons of Light

• The smallest unit of light is a photon
• A photon is often called a particle of light
• The Energy of an individual photon depends on its
  wavelength (frequency)
• The Energy of a photon is proportional to its
  frequency E h f hc / l

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Electromagnetic Spectrum
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Energy Levels and Spectral Lines
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Absorption vs. Emission
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Unique Spectral Lines for Atoms
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More Emission Lines
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Molecular Bands
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Temperature Affects Absorption
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Taking a Temperature
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Thermal Radiation
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Color Related to Temperature
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Spectra in the Lab
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Spectrum from Mars
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Doppler Shift
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Doppler Shifted Spectral Lines
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Doppler Broadening