Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 8, Problem 29RQ
To determine
Is the atmospheric composition has changed since the Sun formed.
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Assume that Hydrogen comprises 79% of the Sun's mass. How much mass is this? 1.57e+30 kg
Only about 11% of the initial Hydrogen in the Sun is in the core where it is hot enough to burn. What was the total mass of the inital H in the core of the Sun?
Hint: Use the answer above and the percent in the core to determine the total mass.
Using the results from above, how much total energy is available to the Sun via nuclear fusion over its lifetime? (HINT: only 0.71% of the total mass of the available H in the core is converted into energy)
Hint: E = m c^2
An image of the disk of the Sun shows a higher brightness at the centre compared to the edges. Explain with the aid of a sketch the reasons for this darkening at the limb of the solar disk.
In images of the solar photosphere there are small regions of the solar disk, about 500 km across, which are about 2.5 times brighter that the surrounding photosphere. Assuming a temperature of 5800 K for the background photosphere, calculate the temperature of these photospheric bright points.
One explanation for these bright points is that the density is lower in these regions. Explain briefly how that could produce the observed brightening.
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 8 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 8 - Prob. 1RQCh. 8 - Prob. 2RQCh. 8 - Prob. 3RQCh. 8 - Prob. 4RQCh. 8 - Prob. 5RQCh. 8 - Prob. 6RQCh. 8 - What evidence can you give that granulation is...Ch. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - Prob. 10RQ
Ch. 8 - Prob. 11RQCh. 8 - Prob. 12RQCh. 8 - Prob. 13RQCh. 8 - Prob. 14RQCh. 8 - Energy can be transported by convection,...Ch. 8 - Prob. 16RQCh. 8 - Prob. 17RQCh. 8 - Prob. 18RQCh. 8 - Prob. 19RQCh. 8 - Meridional is derived from meridian. Look up the...Ch. 8 - Prob. 21RQCh. 8 - Prob. 22RQCh. 8 - How can solar flares affect Earth?Ch. 8 - Prob. 24RQCh. 8 - Why does nuclear fusion require high temperatures...Ch. 8 - Prob. 26RQCh. 8 - Four protons are combined in the proton-proton...Ch. 8 - Give an example of a charged subatomic particle...Ch. 8 - Prob. 29RQCh. 8 - Prob. 30RQCh. 8 - Prob. 31RQCh. 8 - Prob. 32RQCh. 8 - Prob. 33RQCh. 8 - The radius of the Sun is 0.7 million km. What...Ch. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - What is the angular diameter of a star the same...Ch. 8 - If a sunspot has a temperature of 4200 K and the...Ch. 8 - How many watts of radiation does a 1-meter-square...Ch. 8 - If a sunspot has a temperature of 4200 K and the...Ch. 8 - Prob. 8PCh. 8 - Prob. 9PCh. 8 - Prob. 10PCh. 8 - Prob. 11PCh. 8 - Prob. 12PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - The United States consumes about 2.5 1019 J of...Ch. 8 - Prob. 16PCh. 8 - Prob. 1SOPCh. 8 - Prob. 2SOPCh. 8 - Whenever there is a total solar eclipse, you can...Ch. 8 - Prob. 2LTLCh. 8 - Prob. 3LTLCh. 8 - Prob. 4LTLCh. 8 - The two images here show two solar phenomena. What...Ch. 8 - Prob. 6LTL
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- If 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_forwardNeutrinos produced in the core of the Sun carry energy to its exterior. Is the mechanism for this energy transport conduction, convection, or radiation?arrow_forwardThe radius of the Sun is 0.7 million km. What percentage of the radius is taken up by the chromosphere? (Hint: Refer to Figure 8-1.)arrow_forward
- How 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_forwardIf 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.)arrow_forwardDescribe what the Sun would look like from Earth if the entire photosphere were the same temperature as a sunspot.arrow_forward
- Why was the detection of solar neutrinos important? a) They have been suggested as an important source of solar energy. b) They provide direct evidence for solar oscillations. c) The provide direct evidence for the proton-proton chain. Where does nuclear energy production (fusion) occur in the Sun? a) In the nuclear zone b) In all layers of the Sun c) In the photosphere d) In the corearrow_forwardAssuming that (1) the solar luminosity has been constant since the Sun formed, and (2) the Sun was initially of uniform composition throughout, as described by Table 9.2, estimate how long it would take the Sun to convert all of its original hydrogen into helium. [Hint: Calculate the mass of hydrogen in the sun and then divide it by the rate of hydrogen fusion (PPT slide 47.)]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_forward
- Status of Sun's core and its temperature (The letters correspond to the stages in Figure 21.1.) 3. Stage A: T10 million K. Sun is in equilibrium. 4. Stage B: T 100 million K Core collapse stops. 5. Stage C: Helium flash 6. Stage D: T 100 million K. Sun is in equilibrium. 7. Stage E: T800 million K. Core collapse stops. If fusion is occurring in core or in shell around the core, mark with a ✔in the correct column. Core fusion H to He FUSION ✓ Core fusion He to C Shell fusion H to He Shell fusion He to C PRESSURE VERSUS GRAVITY CORE • REST OF THE STAR Pressure comes from electron degeneracy Pressure Gravity Gravity Pressure region contracts and heats Pressure > Gravity region expands and coolsarrow_forwardWhat is the name of the specific nuclear fusion process that dominates energy production in the core of the Sun and gives a brief description of how it works. What I'm looking for in this description is what is the basic premise behind nuclear fusion and what is going into this specific fusion reaction and what comes out of it.arrow_forwardThe Sun’s luminosity (or power) is 4 x 1026 Watts (=J/s). How many kilograms of hydrogen must be fused every second to maintain this luminosity? (hint: work backwards from the energy per second to the mass released to the amount of hydrogen required, using the results from the previous question.) The Sun’s mass is ~2x1030 kg. If 10% of this is Hydrogen available in the core, how long will the Sun be able to continue fusing hydrogen at this rate? This is considered the Sun's "lifetime". If the Sun is 4.6 billion years old (and assuming it's power output is constant), how many years does it have left?arrow_forward
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