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3 - Light

3 - Light. The Wave Nature of Light. Wavelength  - Units: meters (m),  m, nm Frequency  or f - Unit: cycles/s, universally called Hertz (1 Hertz = 1 cycle/s)

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3 - Light

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  1. 3 - Light

  2. The Wave Nature of Light Wavelength - Units: meters (m), m, nm Frequency or f - Unit: cycles/s, universally called Hertz (1 Hertz = 1 cycle/s) Speed - Units: m/s NOTE: v = f  Usually denoted by “c”, in a vacuum (such as interstellar space) it is the same for all wavelengths.

  3. The Electromagnetic Spectrum

  4. Polarized Light

  5. Blackbody Radiation

  6. Blackbody spectrum depends on Temperature - which temperature to use? - Fahrenheit, Celsius, or Kelvin? 0 100 F ice-alcohol mix human body C water freezes water boils (sea level!) K motion stops (same scale as C)

  7. Laws of Blackbody Radiation Wien's Law Wilhelm Wien, in 1893

  8. Wien's Law - Example

  9. Stefan-Boltzmann Law - 1878-1884 Josef Stefan and Ludwig Boltzmann

  10. Stefan-Boltzmann Law

  11. Continuum & Lines Real stars usually have a blackbody-like continuous spectrum, upon which absorption lines are superimposed

  12. Photon-Atom Interactions

  13. Molecular Spectra Rotational Vibrational Electronic

  14. Earth’s Atmosphere

  15. Inverse-square Law of Light

  16. Doppler Effect

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