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Question: 

Estimate the speed of a galaxy, and its distance from us, if the wavelength for the hydrogen line at 434 nm is measured on Earth as being 610 nm.

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

Quick Answer: 

$0.33c$, $4.7 \times 10^9 \textrm{ ly}$

Giancoli 7th Edition, Chapter 33, Problem 30

(2:38)

Chapter 33, Problem 30 is solved.

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