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 20, Problem 44Q
To determine
(a)
The star that the observer would monitor in order to observe a core-collapse supernova explosion from its very beginning.
To determine
(b)
The star from Appendices 4 and 5 that shows the possible supernova candidate.
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Students have asked these similar questions
A supernova’s energy is often compared to the total energy output of the Sun over its lifetime. Using the Sun’s current luminosity, calculate the total solar energy output, assuming a 1010 year main-sequence lifetime. Using Einstein’s formula E=mc2 calculate the equivalent amount of mass, expressed in Earth masses. [Hint: The total energy output of the Sun over its lifetime is given by its current luminosity times the number of seconds in a year times its ten billion-year lifetime; ; mass of earth = 6×1024kg; c = 3×108m/s. Your answer should be 200-300 Earth masses.]
A supernova's energy is often compared to the total energy output of the Sun over its lifetime.
Using the Sun's current luminosity, calculate the total solar energy output, assuming a 1010
year main-sequence lifetime.
Using Einstein's formula E = mc? calculate the equivalent amount of mass, expressed in
Earth masses. [Hint: The total energy output of the Sun over its lifetime is given by its current
luminosity times the number of seconds in a year times its ten billion-year lifetime; Week 5
slide 4; mass of earth = 6x1024kg; c = 3x10®m/s. Your answer should be 200-300 Earth
masses.]
Use
t =
1
M2.5
to compute the life expectancy of a 0.6-solar-mass star. (A solar lifetime is approximately 10 billion years.) yrWhy might this be an underestimate if the star is fully mixed by convection?
a) If the star is fully mixed its mass will be much larger than 0.6 solar masses.
b) If the star is fully mixed its mass will be much smaller than 0.6 solar masses.
c) If the star is fully mixed it will be able to use a larger portion of its hydrogen in fusion than the Sun.
d) If the star is fully mixed it will be able to use a smaller portion of its hydrogen in fusion than the Sun.
Chapter 20 Solutions
Universe: Stars And Galaxies
Ch. 20 - Prob. 1QCh. 20 - Prob. 2QCh. 20 - Prob. 3QCh. 20 - Prob. 4QCh. 20 - Prob. 5QCh. 20 - Prob. 6QCh. 20 - Prob. 7QCh. 20 - Prob. 8QCh. 20 - Prob. 9QCh. 20 - Prob. 10Q
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