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 16, Problem 45Q
To determine
If it is necessary to take Earth’s orbital motion into account when Sun’s rotation rate is determined by observing the sunspots.
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What types of changes effect the Sun's energy output?
Cycle 24 Sunspot Number (V2.0) Prediction (2016 10)
300
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Cycle
Cycle
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24
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O A. 11 year solar sunspot cycles change the amount of radiation given off by the Sun.
O B. As the Sun rotates more energy is scattered to space and less is retained on the surface.
O C. Cycles of solar flares and prominences heat and cool the layers below the Sun's surface.
O D. Solar energy is affected by the core output of photons.
From which atmospheric layer of the Sun did the photons originate that resulted in sunburn? How do you know?
Which of the following layers of the Sun can be seen with some type of telescope? Consider all forms of light, but do not consider neutrinos or other particles. (Give ALL correct answers in alphabetical order, i.e., B, AC, BCD...)A) Corona.B) Photosphere.C) Radiation Zone.D) Chromosphere.E) Convection Zone.F) Core.
Chapter 16 Solutions
Universe: Stars And Galaxies
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- Give proper explanation The surface temperature of the Sun is about 5750 K. What is this temperature on the Fahrenheit scale?arrow_forwardA rotation rate, or frequency, of 500 nHz corresponds to a rotation period of 23 days—it takes 23 days for material to follow one complete circle around the Sun. Furthermore, the frequency and period are inversely proportional to one another: if one is doubled, the other is halved. Given these facts, what is the approximate rotation period (in days) for equatorial material at the Sun's surface? (Use your answer to the previous question as the rotation rate.)arrow_forwardWhat is the cause of sunspots, flares, and prominence? Explain.arrow_forward
- Step-by-step, explain how energy flows from the center of the Sun to Earth.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_forwardExplain how the theory of the Sun’s dynamo results in an average 22-year solar activity cycle. Include the location and mechanism for the dynamo.arrow_forward
- Assume that Hydrogen comprises 74% of the Suns' mass. How much mass is this?arrow_forwardDescribe the process as a photon (energy) created in the Sun's core makes its way out into space. Make sure to consider the different layers that the photon must pass through to reach the Sun's surface.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
- Describe how a convection current works. In a simple way.arrow_forwardEarth's daylight surface disk absorbs about 1036 W per m2 from the Sun. Using 6400 km for the Earth's radius, how much of this radiative power is emitted by each square meter of the spherical Earth? Hint: Compare the ratio of the disk area to the spherical surface area.arrow_forwardEven if the Earth's orbit were circular, we would still have seasons. The reason is that the seasons are actually caused by the tidal influence of the Moon the Sun would still be off-center and our distance from it would still vary the Sun would still have an annual cycle of storms and sunspots the seasons are actually determined by the tilt of the Earth's axisarrow_forward
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