lecture_3

# lecture_3 - Physics 140 Lecture 3 Greenhouse Gases Jan 25...

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Physics 140 Lecture 3 Greenhouse Gases Jan. 25, 2012 1 Sunday, January 29, 12

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Announcements 2 1) For next lecture please read: Dire Predictions -- pp. 32-47 Beyond Smoke and Mirrors -- pp. 27-33 (chapter 4) 2) First homework assignment is due on Monday Sunday, January 29, 12
Temperature 3 Temperature is a measure of the kinetic energy of the molecules. The hotter something is the faster its molecules are moving. Sunday, January 29, 12

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Temperature Scales 4 Sunday, January 29, 12
Temperature Conversions 5 T C = 5 9 ( T F - 32) T F = 9 5 T C + 32 T K = T C + 273 Sunday, January 29, 12

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Thermal Energy Formula 6 Thermal Energy = number of molecules x 1.4 x 10 -23 [Joules / degree Kelvin] x temperature in degrees Kelvin U = N k B T U = n R T Thermal Energy = number of moles x 8.3 [Joules / degree Kelvin] x temperature in degrees Kelvin Sunday, January 29, 12
Blackbody 7 A blackbody is an object that absorbs all of the radiation that is incident on it. The Sun is a blackbody! It absorbs any light that shines on it. A blackbody is only black when it is at absolute zero. At any non zero temperature it will emit electromagnetic radiation Sunday, January 29, 12

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Blackbody Radiation 8 The radiation emitted by a blackbody is very well understood.
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