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physics 2d, quiz 2 notes

physics 2d, quiz 2 notes - Chapter 3.1-3.2 Blackbody...

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Chapter 3.1-3.2 Blackbody radiation; Planck’s theory Maxwell’s theory predicted that the radiated waves would behave in every way like light. Blackbody radiation – is the problem to predict the radiation intensity at a given wavelength emitted by a hot glowing solid at a specific temperature. Gustav Kirchhoff proved a theorem as important as his circuit loop theorem when he showed by arguments based on thermodynamics that for any body in thermal equilibrium with radiation the emitted power is proportional to the power absorbed. A blackbody is defined as an object that absorbs all the electromagnetic radiation falling on it and consequently appears black. The wavelength marking the maximum power emission of a blackbody, lambda max, shifts toward shorter wavelengths as the blackbody gets hotter. Spectral energy density of a blackbody – energy per unit volume per unit frequency of the radiation within the blackbody cavity, u(f,T). Planck was convinced that blackbody radiation was produced by vibrating submicroscopic electric charges, which he called resonators. According to Maxwellian theory, an oscillator of frequency f could have any value of energy and could change its amplitude continuously as it radiated any fraction of its energy. He concluded
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