For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2000 K, let Ic represent the intensity per unit wavelength according to the classical expression for the spectral radiancy and IP represent the corresponding intensity per unit wavelength according to the Planck expression.What is the ratio Ic/IP for a wavelength of (a) 400 nm (at the blue end of the visible spectrum) and (b) 200 mm (in the far infrared)? (c) Does the classical expression agree with the Planck expression in the shorter wavelength range or the longer wavelength range?
For the thermal radiation from an ideal blackbody radiator with a surface temperature of 2000 K, let Ic represent the intensity per unit wavelength according to the classical expression for the spectral radiancy and IP represent the corresponding intensity per unit wavelength according to the Planck expression.What is the ratio Ic/IP for a wavelength of (a) 400 nm (at the blue end of the visible spectrum) and (b) 200 mm (in the far infrared)? (c) Does the classical expression agree with the Planck expression in the shorter wavelength range or the longer wavelength range?
Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN:9781337553292
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter39: Introduction To Quantum Physics
Section: Chapter Questions
Problem 49CP
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For the thermal
with a surface temperature of 2000 K, let Ic represent the intensity
per unit wavelength according to the classical expression
for the spectral radiancy and IP represent the corresponding intensity
per unit wavelength according to the Planck expression.What
is the ratio Ic/IP for a wavelength of (a) 400 nm (at the blue end of
the visible spectrum) and (b) 200 mm (in the far infrared)?
(c) Does the classical expression agree with the Planck expression
in the shorter wavelength range or the longer wavelength range?
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