Multiple Choice
If a hydrogen emission line appears at 656.2 nm in the laboratory, what can we say about a cloud of hydrogen gas, with an emission line at 680.2 nm?
A) It is receding away from us.
B) The location of the emission line has nothing to do with speed.
C) It is neither receding nor approaching us.
D) It is approaching us.
Correct Answer:
Verified
Correct Answer:
Verified
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