Astronomy
Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Chapter 5, Problem 3E

Is your textbook the kind of idealized object (described in section on radiation laws) that absorbs all the radiation falling on it? Explain. How about the black sweater worn by one of your classmates?

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Question #1 a) Plot the energy spectral density p(2) of black-body radiation at T=3000 K and at 7= 5000 K. (These correspond to the apparent temperatures of "warm white" and "cool white" light bulbs.) (Note: Show both curves on a single graph, using a standard plotting software. Report the wave- length in nanometers.) b) For each of these two temperatures, at which wavelength is the radiation intensity maximum? (Note: Report the wavelengths in nanometers. Your answers should be consistent with the curves from part a), of course.)
The maximum intensity of radiation emitted by a star occurs at a surface temperature of 4.3 x 104 K. a) Calculate the wavelength of the emitted radiation when the intensity is maximum. b) Calculate the ratio of the intensity radiated at a wavelength of 60.0 nm to the maximum intensity. Assume that the star radiates like an ideal blackbody.
you are sitting at a desk in a completely dark room. the room is at normal indoor room temperature. there is an inanimate and un-powered object on your desk (e.g., a box, pencil case, notebook,...). what wavelength of blackbody radiation is emitted from that object with greatest intensity? (assume the object has the same temperature as the rest of the room.) express your answer in microns.

Chapter 5 Solutions

Astronomy

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