ESSENTIAL COSMIC PERSPECTIVE - ACCESS CA
ESSENTIAL COSMIC PERSPECTIVE - ACCESS CA
9th Edition
ISBN: 9780135795125
Author: Bennett
Publisher: PEARSON
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Chapter 11, Problem 54EAP
To determine

The gas pressure of the atmosphere inthe three layers.

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62. Pressure of the Photosphere. The gas pressure of the photosphere changes substantially from its upper levels to its lower levels. Near the top of the photosphere, the temperature is about 4500 K and there are about 1.6 x 1016 gas particles per cubic centimeter. In the middle, the temperature is about 5800 K and there are about 1.0 x 10" gas particles per cubic centimeter. At the bottom of the photosphere, the temperature is about 7000 K and there are about 1.5 × 10" gas particles per cubic centimeter. Use the ideal gas law (Mathematical Insight 14.2) to compare the pressures of each of these layers; explain the reason for the trend that you find. How do these gas pressures compare with Earth's atmospheric pressure at sea level?
Describe what the Sun would look like from Earth if the entire photosphere were the same temperature as a sunspot.
If a sunspot has a temperature of 4,270 K and the average solar photosphere has a temperature of 5,780 K, how many times more energy is emitted in 1 second from a square meter of the photosphere compared to a square meter of the sunspot? (Hint: Use the Stefan-Boltzmann law,  E = σT4 (J/s/m2)  where E is the energy, σ is a proportionality constant equal to 5.67 ✕ 10−8 J/s/m2/K4, and T is the temperature in kelvins.)
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