A gas that absorbs light of wavelength 500 nm in the laboratory. Suppose there is a c

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Homework Statement


a gas that absorbs light of wavelength 200 nm in the laboratory. Suppose there is a cold cloud of the same gas between you and a hot source of continuum (blackbody) radiation, and the cloud is moving away from Earth. You will see a spectrum with


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The Attempt at a Solution


absorption line at a wavelength longer then 200nm. since the cold cloud is moving away so would have a red shift right?
 

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