Chapter 34, Problem 15PE

### College Physics

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

Chapter
Section

### College Physics

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

# (a) What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an approximate value, assume the expansion rate is constant and calculate the speed at which two galaxies must move apart to be separated by 1 Mly (present average galactic separation) in a time of 1010 y. (b) Similarly, what Hubble constant corresponding to a universe approximately old?

To determine

(a)

The Hubble constant corresponding to an approximate age of the universe1010 years.

Explanation

Given:

Age of Universe =1010Â years

Separation between galaxies = 1 Mly

Formula used:

Find velocity using:

â€ƒâ€ƒVelocityÂ =Â distance/time

Then find H0which is equal tovelocity/time

Calculation:

â€ƒâ€ƒVelocityÂ =Â distance/timevÂ =Â (1Â Mly/1010Y)=Â (1Â xÂ 106ly1010y)Â xÂ (Â 9.46Â x1012Km1ly)Â xÂ (1y3

To determine

(b)

The Hubble constant corresponding to a universe approximatelyy old.

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