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Black body radiation - Radiation is emitted from all objects above absolute zero; the rate of energy per unit area per unit time is proportional to T4.
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Black body radiation Introduction Radiation is emitted from all objects above absolute zero; the rate of energy per unit area per unit time is proportional to T4. P=?A?T4 P?T4 P= power Watts ?= emissivity unit less constant related to the colour and reflectivity ?=Stephan's constant Wm-2k-4 T=temperature Kelvin The peak wavelength of the radiation emitted can be calculated from Wein's displacement law which states ?mT=2.898x10-3 where ?m is the peak wavelength. I will be investigating Wein's displacement law and the emissivity of a number of different surfaces. I will also be investigating how power affects temperature using Stefan's power law. Experiment 1 I will be using a computer program to simulate various temperatures and recording the peak wavelength (?m) that corresponds to a number of temperatures. I will then be plotting a graph of ?m against 1/T, the gradient of which should be 2.898x10-3 mK. I will compare my results with Wein's displacement law (see example below). Experiment 2 I will fill a...
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