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3 - Light

3 - Light. The Wave Nature of Light. Wavelength λ - Units: meters (m), μ m , nm Frequency ν 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 Wavelengthλ - Units: meters (m), μm, nm Frequencyν or f - Unit: cycles/s, universally called Hertz (1 Hertz = 1 cycle/s) Speed - Units: m/s NOTE: v = f λ Usually denoted by “c”, in a vacuum (such as interstellar space) it is the same for all wavelengths. http://ngsir.netfirms.com/englishhtm/TwaveA.htm

  3. The Electromagnetic Spectrum 1 hertz = 1 cycle/second (one complete wave per second)

  4. Polarized Light http://ngsir.netfirms.com/englishhtm/Polarization.htm http://micro.magnet.fsu.edu/primer/java/scienceopticsu/polarizedlight/filters/index.html

  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 http://lectureonline.cl.msu.edu/~mmp/applist/blackbody/black.htm

  8. Wien's Law - Example

  9. Stefan-Boltzmann Law - 1878-1884 Josef Stefan and Ludwig Boltzmann http://www.uni.edu/morgans/ajjar/Astrophysics/blackbody3.html

  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 For a nice animation of vibrating water molecules see: http://www2.ess.ucla.edu/~schauble/MoleculeHTML/H2O_html/H2O_page.html

  14. Earth’s Atmosphere

  15. Inverse-square Law of Light

  16. Doppler Effect http://www.walter-fendt.de/ph14e/dopplereff.htm

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