21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 13, Problem 3QP
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. The spectrum of Star A peaks at 700 nm. The spectrum of Star B peaks at 470 nm. We know nothing about what stage of stellar evolution either of these stars are in. Which of the following are true? A. Star A has a higher luminosity than Star B. B. Star B has a higher luminosity than Star A. C. Star A is cooler than Star B. D. Not enough information to comment on their luminosities. E. B and C F. C and D
A star that is moving toward Earth will   a. have its spectral lines shifted to the red.   b. have its spectral lines shifted to the blue.   c. appear hotter than it actually is.   d. appear cooler than it actually is.   e. appear dimmer than it actually is.
The spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is less than its laboratory value of 656.3 nm, one can conclude that...   A. The separation between Earth and the star is decreasing.   B. The separation between Earth and the star is increasing.   C. The separation between Earth and the star is unchanging   D. No conclusion is possible.
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