GATE PH 2021 PH Q24: Atomic and Molecular Physics

Consider the atomic system as shown in the figure, where the Einstein A coefficients for spontaneous emission for the levels are

and

. If

atoms/cm

are excited from level 0 to level 2 and a steady state population in level 2 is achieved, then the steady state population at level 1 will be

. The value of

(in integer) is ______.

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