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Micro meter = millionth of a meter Micro meter = m m Visible light 0.4 m m to 0.7 m m

Micro meter = millionth of a meter Micro meter = m m Visible light 0.4 m m to 0.7 m m. Radiation Laws As temperature increases wavelength of maximum radiant intensity, l max , increases. Wein’s Displacemnet Law. T=6000 K. Sun. Earth. T=300 K. Radiation Laws

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Micro meter = millionth of a meter Micro meter = m m Visible light 0.4 m m to 0.7 m m

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  1. Micro meter = millionth of a meter • Micro meter = mm • Visible light 0.4 mm to 0.7 mm

  2. Radiation Laws As temperature increases wavelength of maximum radiant intensity, lmax, increases. Wein’s Displacemnet Law. T=6000 K Sun Earth T=300 K

  3. Radiation Laws As temperature increases wavelength of maximum radiant intensity, lmax, increases. Wein’s Displacemnet Law. Sun Earth

  4. Radiation Laws As temperature increases total radiation output increases. Stefan_Boltzman Radiation Law. Brightness = Intensity Energy leaving an object each sec per square meter As T double Brightness increases by ___??____ As T triples Brightness increases by _______

  5. Radiation Laws As temperature increases total radiation output increases. Stefan_Boltzman Radiation Law. Brightness = Intensity Energy leaving an object each sec per square meter As T double Brightness increases by 16 As T triples Brightness increases by _____

  6. Black Body e=1.0

  7. The hole acts like a blackbody. All radiant energy is absorbed none is reflected. If the inside of the cavity were to become hot then the hole would glow.

  8. No Atmosphere Solar In IR out Surface gets energy only from the sun when there is no atmosphere Image modified from: http://www.usatoday.com/weather/tg/wghwrmng/wghwrmng.htm

  9. With an Atmosphere Surface gets solar energy from the sun and infrared energy from the atmosphere when there is an atmosphere. Image modified from: http://www.usatoday.com/weather/tg/wghwrmng/wghwrmng.htm

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