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Physics: Principles with Applications | 6th Edition | ISBN: 9780130606204 | Authors: Douglas C. Giancoli
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a star 1000 times brighter than our Sun (that is, emitting

Chapter 1, Problem 31PE

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QUESTION:

a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly goes supernova. Using data from Table 7.3: (a) By what factor does its power output increase? (b) How many times brighter than our entire Milky Way galaxy is the supernova? (c) Based on your answers, discuss whether it should be possible to observe supernovas in distant galaxies. Note that there are on the order of 1011 observable galaxies, the average brightness of which is somewhat less than our own galaxy.

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QUESTION:

a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly goes supernova. Using data from Table 7.3: (a) By what factor does its power output increase? (b) How many times brighter than our entire Milky Way galaxy is the supernova? (c) Based on your answers, discuss whether it should be possible to observe supernovas in distant galaxies. Note that there are on the order of 1011 observable galaxies, the average brightness of which is somewhat less than our own galaxy.

ANSWER:

Step-by-step solution Step 1 of 3 (a) Refers to the table 7.3 provided in the textbook Power output of the supernova is . As, brightness is directly proportional to the power output so the power output of the star is 1000 times the power output of our sun. Since, power output of our sun is Therefore, the power output of the star is Compare the power output of the star to the power output of the supernova The factor by which the power output star increases is .

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