Working It Out 6.3 Wien's Law Look again at Figure 6.17. Notice where the peak of each curve lines up along the horizontal axis. As the temperature, T, increases, the peak of the spectrum shifts toward shorter wave- lengths. This is an inverse proportion. Translating this into math, and inserting the constant of 2,900 um-K (derived from measure- ments of this relationship) to fix the units, we find: Suppose we want to calculate the peak wavelength at which Earth radiates. If we insert Earth's average temperature of 288 K into Wien's law, we get 2,900 pm -K 2.900 um-K 288 K 2,900 pum - K A 10.1 pum This is Wien's law (pronounced "Voen's law"), named for Ger- man physicist Wilhelm Wien (1864-1928), who discovered the relationship. In this equation, Xyusa (pronounced "lambda peak") is the wavelength where the spectrum is at its peak, where the electromagnetic radiation from an object is greatest. or slightly more than 10 pm. Earth's radiation peaks in the infra- red region of the spectrum. The average surface temperature of Venus is 773 Ke.
Working It Out 6.3 Wien's Law Look again at Figure 6.17. Notice where the peak of each curve lines up along the horizontal axis. As the temperature, T, increases, the peak of the spectrum shifts toward shorter wave- lengths. This is an inverse proportion. Translating this into math, and inserting the constant of 2,900 um-K (derived from measure- ments of this relationship) to fix the units, we find: Suppose we want to calculate the peak wavelength at which Earth radiates. If we insert Earth's average temperature of 288 K into Wien's law, we get 2,900 pm -K 2.900 um-K 288 K 2,900 pum - K A 10.1 pum This is Wien's law (pronounced "Voen's law"), named for Ger- man physicist Wilhelm Wien (1864-1928), who discovered the relationship. In this equation, Xyusa (pronounced "lambda peak") is the wavelength where the spectrum is at its peak, where the electromagnetic radiation from an object is greatest. or slightly more than 10 pm. Earth's radiation peaks in the infra- red region of the spectrum. The average surface temperature of Venus is 773 Ke.
College Physics
10th Edition
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter12: The Laws Of Thermodynamics
Section: Chapter Questions
Problem 28P: Suppose the Universe is considered to be an ideal gas of hydrogen atoms expanding adiabatically. (a)...
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