Bundle: Foundations Of Astronomy, 14th + Mindtap Astronomy, 1 Term (6 Months) Printed Access Card

14th Edition

ISBN: 9780357000427

Author: Michael A. Seeds, Dana Backman

Publisher: Cengage Learning

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Textbook Question

Chapter 8, Problem 7P

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.)

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Chapter 8, Problem 6P

Chapter 8, Problem 8P

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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.)

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.

a) At solar maximum sunspots might cover up to 0.4% of the total area of the Sun. If the sunspots have a temperature of 3800 K and the surrounding photosphere has a temperature of 6000 K, calculate the fractional change (as a percentage) in the luminosity due to the presence of the sunspots. b) A star of the same stellar class as the Sun is observed regularly over many years, and a time series of its bolometric apparent magnitude is collected. What would be the signal in this time series which indicated that the star had a magnetic dynamo similar to the Sun? Briefly describe two or three possible sources of other signals which could confuse the interpretation of the data.

Chapter 8 Solutions

Bundle: Foundations Of Astronomy, 14th + Mindtap Astronomy, 1 Term (6 Months) Printed Access Card

Ch. 8 - Prob. 1RQ Ch. 8 - Prob. 2RQ Ch. 8 - Prob. 3RQ Ch. 8 - Prob. 4RQ Ch. 8 - Prob. 5RQ Ch. 8 - Prob. 6RQ Ch. 8 - What evidence can you give that granulation is...Ch. 8 - Prob. 8RQ Ch. 8 - Prob. 9RQ Ch. 8 - Prob. 10RQ

Ch. 8 - Prob. 11RQ Ch. 8 - Prob. 12RQ Ch. 8 - Prob. 13RQ Ch. 8 - Prob. 14RQ Ch. 8 - Energy can be transported by convection,...Ch. 8 - Prob. 16RQ Ch. 8 - Prob. 17RQ Ch. 8 - Prob. 18RQ Ch. 8 - Prob. 19RQ Ch. 8 - Meridional is derived from meridian. Look up the...Ch. 8 - Prob. 21RQ Ch. 8 - Prob. 22RQ Ch. 8 - How can solar flares affect Earth?Ch. 8 - Prob. 24RQ Ch. 8 - Why does nuclear fusion require high temperatures...Ch. 8 - Prob. 26RQ Ch. 8 - Four protons are combined in the proton-proton...Ch. 8 - Give an example of a charged subatomic particle...Ch. 8 - Prob. 29RQ Ch. 8 - Prob. 30RQ Ch. 8 - Prob. 31RQ Ch. 8 - Prob. 32RQ Ch. 8 - Prob. 33RQ Ch. 8 - The radius of the Sun is 0.7 million km. What...Ch. 8 - Prob. 2P Ch. 8 - Prob. 3P Ch. 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. 8P Ch. 8 - Prob. 9P Ch. 8 - Prob. 10P Ch. 8 - Prob. 11P Ch. 8 - Prob. 12P Ch. 8 - Prob. 13P Ch. 8 - Prob. 14P Ch. 8 - The United States consumes about 2.5 1019 J of...Ch. 8 - Prob. 16P Ch. 8 - Prob. 1SOP Ch. 8 - Prob. 2SOP Ch. 8 - Whenever there is a total solar eclipse, you can...Ch. 8 - Prob. 2LTL Ch. 8 - Prob. 3LTL Ch. 8 - Prob. 4LTL Ch. 8 - The two images here show two solar phenomena. What...Ch. 8 - Prob. 6LTL

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