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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

Distances to local galaxies are determined by measuring the brightness of stats, called Cepheid variables, that can be observed individually and that have absolute brightnesses at a standard distance that are well known. Explain how the measured brightness would vary with distance as compared with the absolute brightness.

To determine

The procedure for the measurement of star brightness that varies with the distance as compared with the absolute brightness.

Explanation

The astronomers define the brightness of a star in terms of apparent magnitude. It describes the brightness of the star that appeared from Earth as well as absolute magnitude which tells about the brightness of the star that appeared from a standard distance, 32.6 light-years.

Luminosity is also defined as a quantitative measure of brightness. It tells the amount of energy (light) that is emitted by a star from its surface. Thus, brightness can be stated as eternal property of star and is based on its composition...

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