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This is a short answer problem. Please provide answer with explanations. Thanks. 4. The spectrum of...

This is a short answer problem. Please provide answer with explanations. Thanks.

4. The spectrum of a distant galaxy is observed to include a spectral line at 524 nanometers.  The rest value for this spectral line is 393 nanometers.

a. How long ago did the light leave this galaxy?  

b. Can you use this information to determine the present distance to the galaxy? Explain.  

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