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**1. Homework Statement**

The wavelength of a particular ultraviolet radiation from hydrogen atoms is 1.216 e-7 m. Calculate the wavelength when the corresponding radiation from hydrogen in a distant galaxy is observed here on earth. The galaxy is receding at a speed of 0.11 c.

**2. Homework Equations**

**3. The Attempt at a Solution**

I'm not sure what to do with the "receding at a speed of .11c" to solve this problem.. suggestions?