Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 16, Problem 54Q
To determine
Whether the intensity of sunlight would decrease just as abruptly, or not, if thermonuclear fusion in the Sun stopped abruptly. State reasons for the same.
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Suppose thermonuclear fusion in the Sun’s core stopped abruptly. Would the intensity of sunlight decrease just as abruptly? Why or why not?
Explain why there is the low number of observed solar neutrinos?
The sun has a radius of 6.959 × 108 m and a surface temperature of 5.81 x 10° K.
When the sun radiates at a rate of 3.91 x 1026 W and is a perfect emitter. What is
the rate of energy emitted per square meter? Stefan-Boltzmann constant is 5.67 x
10-8 J/s-m2 K4
a)
5.6 x 107 W/m2
b) 12.8 x 107 W/m2
c)
6.4 x 107 W/m2
25.6 x 107 W/m2
5.6 x 1017 W/m2
Chapter 16 Solutions
Universe
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- Starting from the core of the Sun and going outward, the temperature decreases. Yet, above the photosphere, the temperature increases. How can this be?arrow_forwardExplain how we know that the Sun’s energy is not supplied either by chemical burning, as in fires here on Earth, or by gravitational contraction (shrinking).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
- Do you think that nuclear fusion takes place in the atmospheres of stars? Why or why not?arrow_forwardWhat do measurements of the number of neutrinos emitted by the Sun tell us about conditions deep in the solar interior?arrow_forwardIf a sunspot has a temperature of 4200 K and the average solar photosphere has a temperature of 5780 K, how much 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, Eq. 7-1.)arrow_forward
- Why does nuclear fusion only take place in the Sun’s core?arrow_forwardFusion only occurs in the solar core. Assuming that 10% of the Sun’s total mass is available to participate in fusion, how long can the Sun continue hydrogen fusion until all available mass is used up? (express your answer in years)arrow_forwardHow does energy makes its way from the nuclear core of the Sun to its atmosphere? Choose the correct order for each layer. → O radiative zone, convection zone, photosphere, chromosphere, transition region, corona O convection zone, radiative zone, chromosphere, photosphere, transition region, corona convection zone, radiative zone, photosphere, chromosphere, transition region, corona O radiative zone, convection zone, chromosphere, transition region, photosphere, corona O radiative zone, convection zone, chromosphere, photosphere, transition region, corona #m с d $ 4 e 30 f % 5 t g bo 6 M 7 & 7 h O u 8 9arrow_forward
- How many watts of radiation does a 1-meter square region of the Sun's photosphere emit at a temperature of 500 K ? How much would the wattage increase if the temperature was doubled?arrow_forwardWhat produced the helium now present in the sun's atmosphere?arrow_forwardThe 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.arrow_forward
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