Chapter 12, Problem 17P

### Inquiry into Physics

8th Edition
Ostdiek
ISBN: 9781337515863

Chapter
Section

### Inquiry into Physics

8th Edition
Ostdiek
ISBN: 9781337515863
Textbook Problem

# . If a galaxy is found to have a recessional speed of 140,000 km/s, about how far away is it? The current estimate of the precision of the Hubble parameter is approximately Â±5%. Determine the range within which the true distance to the galax lies.

13
To determine

The range in which galaxy lies.

Explanation

Given info:

â€ƒâ€ƒRecessionalÂ speedÂ (v)=140000Â km/sHo=20.8Â kmsâˆ’mly

Formula used:

â€ƒâ€ƒv=H0dv=velocityd=distanceHo=Hubble'sconstant

Calculation:

Substituting the given values, we get

â€ƒâ€ƒ140000=20.8Ã—dd=6730.76Â mly

For range Â±5%

Upper limit Ho=20

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