2 3 (a) The Einstein A coefficient of the 3p² 3P₁/2 →38² ³S1/2 transition in sodium is 6.14 x 107 s¹. A gas of sodium at
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2 3 (a) The Einstein A coefficient of the 3p² 3P₁/2 →38² ³S1/2 transition in sodium is 6.14 x 107 s¹. A gas of sodium at
2 3 (a) The Einstein A coefficient of the 3p² 3P₁/2 →38² ³S1/2 transition in sodium is 6.14 x 107 s¹. A gas of sodium atoms is excited to the 3p2 ³P1/2 level at time t = 0. What fraction of the atoms are still in the upper level after 20 ns ? [5 marks]
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