Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 17, Problem 77Q
To determine

The accuracy of the opinion which says that the hydrogen cannot be the major element of the sun due to the weak absorption lines of the hydrogen spectrum.

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The surface temperature of the Sun is about 6000K. For this question, assume it is exactly   6000K. Now suppose that the surface temperature of the Sun was 12,000 K, rather than 6,000 K. a) How much more thermal radiation would the Sun emit, compared to its current output? Answer as a whole number, which is the ratio of the new to the old output.
At the surface of the sun, the temperature is approximately 5800 K. What fraction of the energy is in the visible portion of the spectrum? (Hint: Do the integral numerically.)
From which atmospheric layer of the Sun did the photons originate that resulted in sunburn? How do you know?

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Universe: Stars And Galaxies

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