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Question: 

Radiotelescopes are designed to observe 21-cm waves emitted by atomic hydrogen gas. A signal from a distant radio-emitting galaxy is found to have a wavelength that is 0.10 cm longer than the normal 21-cm wavelength. Estimate the distance to this galaxy.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$68 \textrm{ Mly}$

Giancoli 7th Edition, Chapter 33, Problem 31

(2:31)

Chapter 33, Problem 31 is solved.

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