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College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs
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Distances to very remote galaxies are estimated based on

Chapter 34, Problem 10

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QUESTION:

Problem 10CQ

Distances to very remote galaxies are estimated based on their apparent type, which indicate the number of stars in the galaxy, and their measured brightness. Explain how the measured brightness would vary with distance. Would there be any correction necessary to compensate for the red shift of the galaxy (all distant galaxies have significant red shifts)? Discuss

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QUESTION:

Problem 10CQ

Distances to very remote galaxies are estimated based on their apparent type, which indicate the number of stars in the galaxy, and their measured brightness. Explain how the measured brightness would vary with distance. Would there be any correction necessary to compensate for the red shift of the galaxy (all distant galaxies have significant red shifts)? Discuss

ANSWER:

Solution  10CQ

The apparent brightness m is dependent on the actual brightness M and the distance  D of the galaxy from observer. The formula is given by:

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