Meteorology Class Lecture Notes Week 3
Meteorology Class Lecture Notes Week 3 metr 121
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This 1 page Class Notes was uploaded by Savannah Notetaker on Wednesday September 7, 2016. The Class Notes belongs to metr 121 at Western Kentucky University taught by Rezaul Mahmood in Fall 2016. Since its upload, it has received 3 views. For similar materials see METEOROLOGY in Science at Western Kentucky University.
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Date Created: 09/07/16
Meteorology Week 3 Notes 9/7/16 Day #5 Heat and Energy Class Lecture Continued Electromagnetic Waves (EM) (Radiation): • everything emits EM waves • radiates at wide range of wavelengths (spectrum) • total radiation energy depends on temperature (Stefan-Boltzmann Law) Wien’s Displacement Law • • Kirchhoff's Law Long waves vs. Short waves *measured by the distance between the waves* Reﬂected light Absorbed light Transmitted light Visible Light Spectrum: 0.4 um 0.7um (micrometer) “higher the temp, higher the amount of radiation. The rate of radiation is higher under higher temperature” -Stefan Boltzmann Law Wein’s Displacement as temp increases, the waves are shorter. Kirchhoff’s Law: good absorbers are good emitters. Blackbody: a perfect absorber or emitter Kirchhoff’s Law: all objects not only absorb radiation, but also emit it • • emit=absorb: balanced, temp no change • emit>absorb: getting colder • emit<absorb: getting warmer Absorption=Emission Radiative Equilibrium Ex: Earth 255K (-18C) Atmosphere is not a blackbody, it is selective absorber Selective Absorber: any object that absorbs some radiation but not others
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