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In LASERs,if N,is number of atoms in ground level and N2 that in higher energy level and N2 that in higher energy level,the population inversion is achieved when: ?->(Show Answer!)
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1. In LASERs,if N,is number of atoms in ground level and N2 that in higher energy level and N2 that in higher energy level,the population inversion is achieved when:





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