Lect2 -- Energy Transformation

Lect2 -- Energy Transformation - 2013829 BlackBodyRadiation...

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2013 8 29 1 Energy Transformation Black Body Radiation Examples of Energy Transformation How stuff works The Second Law of Thermodynamics 1) What is the First Law of Thermodynamics? 2) What determines the color of light that a hot object emits: a) its color in reflected light; b) its temperature; c) its heat capacity; d) its mass 3) Which of the following releases more potential energy? Pop Quiz #2 a) Lower 1 kg water by 60 m; b) Lower 2 kg lead by 20 m. 4) The electromagnetic force between two charged particles depends on: a) the sum of the two charges; b) the product of the two charges; c) the separation of the two charges; d) all of the above; e) only b and c 5) Kilowatt hours is a measure of: a) Force b) Power c) Energy d) none of the above. The Electromagnetic Spectrum Electromagnetic spectrum Visible Spectrum: What determines Color of Light Emission? Black Body Radiation All objects emit electromagnetic radiation, with a spectrum that depends on absolute temperature. There are 2 characteristics: λ max = (constant)/T Total =(const)*T 4 T is K Spectrum
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2013 8 29 2 35% reflected 65% absorbed, reradiated as Earthlight (IR) Sunlight (visible) Earth Radiation Balance Earth temp changes until Input = Output Earth Sun System Fusion of Hydrogen to Helium + Energy T = 5778 K Electromagnetic Radiation Black Body Spectrum.
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