Between which two layers, population inversion takes place?
A. E3 and E3 B. E1 and E3
C. E1 and E2 D. All of above
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Answer:
E1 and E2
Explanation:
Between E2 and E1, there are more electrons in E2 level and it also has higher energy. Hence, population inversion exists between E2 and E1.
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