Foundations of Astronomy (MindTap Course List)
Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 7, Problem 2P

Answer these questions for celestial bodies at each of the following temperatures and then draw a conclusion about the relationship between temperature and wavelength of maximum intensity. What is the wavelength of maximum intensity? In which part of the electromagnetic spectrum (gamma-ray, X-ray, UV, visible light, IR, microwave, or radio) does this peak wavelength lie? Give an example of an object that might have this temperature.

  1. a. 50 K
  2. b. 500 K
  3. c. 5000 K
  4. d. 50,000 K
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Why don’t we see hydrogen Balmer lines in the spectra of stars with temperatures of 45,000 K?   a. There is no hydrogen in stars this hot.   b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy.   c. These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state.   d. Stars of this temperature are too cool to produce an absorption spectrum.   e. Stars of this temperature are too hot to produce an absorption spectrum.
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