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

Radiation Laws As temperature increases wavelength of maximum radiant intensity, max, increases. Weins Displacemnet Law. Sun Earth T=6000 K T=300 K

Radiation Laws As temperature increases wavelength of maximum radiant intensity, max, increases. Weins Displacemnet Law. Sun Earth

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 _______

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 _____

Black Body =1.0

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.

Image modified from: Surface gets energy only from the sun when there is no atmosphere No Atmosphere Solar In IR out

Surface gets solar energy from the sun and infrared energy from the atmosphere when there is an atmosphere. Image modified from: With an Atmosphere