Which of the Following Is Essential for the Laser Action

question 39

Multiple Choice

Which of the following is essential for the laser action to occur between two energy levels of an atom?

• A)the lower level is metastable
• B)there are more atoms in the upper level than in the lower level
• C)there are more atoms in the lower level than in the upper level
• D)the lower level is the ground state
• E)the lasing material is a gas

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