462b - —.— I In woo Max Planclr was able to solve the...

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Unformatted text preview: —...— I In woo Max Planclr was able to solve the problem how to describe the distribu- tion of energy in blackbody radiation, in other words, how the total energy divides among the different wavelength intervals at a given temperature. The two assumptions making the discovery of Planck's Radiation Law possible initiated the science of quantum theory. iiThe energy of vibrating molecules within the blackbody material is quantized, transitioning in discrete units of energy between allowed energy states called quantum states. 2} Light energy is absorbed or emitted in discrete units, now called photons. Photon energy is directly proportional to light frequency. I A blackbpdy is an idealized object that only absorbs and emits light, so the radiation leaving a blackbody contains no reflected light, This makes the blackbody a very useful model system because the spectral characteristics of the light depend only on the intrinsic properties of the object. I Planck’s Radiation Law can be used to determine the peak of the energy dis- tri bution, what wavelength range is the most prominent. As the temperature increases, a greater proportion of light is emitted at shorter wavelengths {as an object gets hotter, it shifts from glowing red to glowing blue]. THE RELhTIEIHSHIF arrivEEu PHoTou ENERGY AND FHEdUEHcv {E mm It. are are THE MOST iMPDRTANT REATIDNSHIPS IN FH‘rSIcs, HEARL‘I' tinrr coMPREHEHSIvE PH'rs'Ics Emu Has AT LEAST out quEsnoH wHEaE vou HEEp THIS HHDWLEDGE. E m J mm ...
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