ESSENTIAL COSMIC PERS.-W/MASTER.ACCESS
9th Edition
ISBN: 9780135795750
Author: Bennett
Publisher: PEARSON
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Chapter 11, Problem 47EAP
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To Explain: The output of X-ray output being more pronounced than that of the visible light.
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1) What is thermal equilibrium? Is the Sun in thermal equilibrium? How do we know this?
2) In order to maintain thermal equilibrium, how much energy must the Sun generate every second?
1. The Sun radiates energy like a black body with temperature 5800 K. Use the Stefan-Boltzmann Law to calculate the Sun's Luminosity (which is the Sun's Surface Area times the Flux radiated per unit surface area.
Use the following parameters:
Sun's Radius = R = 6.96 x 1010 cm Stefan-Boltzmann Const = s = 5.67 x 10-5 ergs/cm2 K4 sSun's Temperature = T = 5800 K Formula for Luminosity: L = 4pR2 sT 4
What is the Sun's Luminosity? __________ ergs/s
Chapter 11 Solutions
ESSENTIAL COSMIC PERS.-W/MASTER.ACCESS
Ch. 11 - Prob. 1VSCCh. 11 - Prob. 2VSCCh. 11 - Prob. 3VSCCh. 11 - Prob. 1EAPCh. 11 - Prob. 2EAPCh. 11 - Prob. 3EAPCh. 11 - Prob. 4EAPCh. 11 - Prob. 5EAPCh. 11 - Prob. 6EAPCh. 11 - Prob. 7EAP
Ch. 11 - Prob. 8EAPCh. 11 - Prob. 9EAPCh. 11 - Prob. 10EAPCh. 11 - Prob. 11EAPCh. 11 - Prob. 12EAPCh. 11 - Prob. 13EAPCh. 11 - Prob. 14EAPCh. 11 - Prob. 15EAPCh. 11 - Prob. 16EAPCh. 11 - Prob. 17EAPCh. 11 - Prob. 18EAPCh. 11 - Prob. 19EAPCh. 11 - Prob. 20EAPCh. 11 - Prob. 21EAPCh. 11 - Prob. 22EAPCh. 11 - Prob. 23EAPCh. 11 - Prob. 24EAPCh. 11 - Prob. 25EAPCh. 11 - Which of these groups of particles has the...Ch. 11 - Prob. 27EAPCh. 11 - Prob. 28EAPCh. 11 - Prob. 29EAPCh. 11 - Prob. 30EAPCh. 11 - Prob. 31EAPCh. 11 - Prob. 32EAPCh. 11 - Prob. 33EAPCh. 11 - 34. What causes the cycle of solar activity? (a)...Ch. 11 - 35. Which of these things poses the greatest...Ch. 11 - Prob. 37EAPCh. 11 - Prob. 38EAPCh. 11 - Prob. 39EAPCh. 11 - Prob. 41EAPCh. 11 - Prob. 42EAPCh. 11 - Prob. 43EAPCh. 11 - Prob. 44EAPCh. 11 - Prob. 45EAPCh. 11 - Prob. 46EAPCh. 11 - Prob. 47EAPCh. 11 - Prob. 48EAPCh. 11 - Research: Current Solar Weather. Daily information...Ch. 11 - Prob. 51EAPCh. 11 - Prob. 52EAPCh. 11 - Prob. 53EAPCh. 11 - Prob. 54EAPCh. 11 - Prob. 55EAPCh. 11 - Prob. 56EAP
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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?arrow_forwardFrom which atmospheric layer of the Sun did the photons originate that resulted in sunburn? How do you know?arrow_forward57. Solar Power Collectors. This problem leads you through the calculation and discussion of how much solar power can in principle be collected by solar cells on Earth. a. Imagine a giant sphere with a radius of 1 AU surrounding the Sun. What is the surface area of this sphere, in square meters? (Hint: The formula for the surface area of a sphere is 4rr2.) b. Because this imaginary giant sphere surrounds the Sun, the Sun's entire luminosity of 3.8 × 1020 watts must pass through it. Calculate the power passing through each square meter of this imaginary sphere in watts per square meter. Explain why this number represents the maximum power per square meter that a solar collector in Earth orbit can collect. c. List several reasons why the average power per square meter collected by a solar collector on the ground will always be less than what you found in part b. d. Suppose you want to put a solar collector on your roof. If you want to optimize the amount of power you can collect, how…arrow_forward
- What is neutrino hypothesis? What is the need and significance of the hypothesis?arrow_forwardChoose the appropriate wavelengths of light in nanometers. Note that answers may be used multiple times or not at all. What is the shortest wavelength of light that our eyes usually can see? What is the shortest wavelength of UVC light? What wavelength of light is too long to be visible to the human eye?arrow_forwardThe capture of too few solar neutrinos by Davis in the solar neutrino experiment a. can be explained if the sun is not undergoing thermonuclear fusion of hydrogen in its core. b. indicates that the sun’s core is much cooler than expected. c. indicates that the sun’s core is much hotter than expected. d. indicates that the sun’s core is convective. e. is explained by none of the above.arrow_forward
- Why are measurements of the Sun's 10.7 cm radio emission used to monitor the state of the solar cycle? Choose allcorrect answers.A. It provides a repeatable, objective measurement of solar activityB. It serves as a good proxy for EUV emissionsC. It is measured from space, so it is not affected by cloudsD. It can be used to predict the occurrence of coronal mass ejectionsarrow_forwardThe United States consumes about 2.51019 J of energy in all forms in a year. How many years could you run the United States on the energy released by the solar flare in Problem 8?arrow_forwardMake a sketch of the Sun’s atmosphere showing the locations of the photosphere, chromosphere, and corona. What is the approximate temperature of each of these regions?arrow_forward
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