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1.Answer the following questions A) Describe how the molecules in a gas produce an emission spectrum. How...

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Physics

1.Answer the following questions

A) Describe how the molecules in a gas produce an emissionspectrum. How is this useful in astronomy if we assume that thelaws of physics are the same everywhere?

B) Why was the uniform expansion model adopted? How does thislead to a necessary differentiation between classical andcosmological redshift

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