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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 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 signi?cant ted shifts)? Discuss possible causes of uncertainties in these measurements.

To determine

The variation of measured brightness of a star with distance. Would there be any correction necessary to compensate for the red shift of the galaxy. Also, state the possible causes of uncertainties in these measurements

Explanation

The brightness of the star is inversely proportional to the square root of the distance of observation and thus it decreases as the distance increases. This is because the farther is the star, more is the spreading of its light over a larger area.

The more distant the star, the more it is red shifted. There is correction that necessary to compensate for the red shift of the galaxy...

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