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Which (if any) of the following are esse...

Which (if any) of the following are essential for laser action to occur between two energy levels of an atom?

A

There are more atoms in the upper level than in the lower

B

The upper level is metastable

C

The lower level is metastable

D

The lower level is the ground state of the atom

Text Solution

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The correct Answer is:
A, B
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