Solution to 2008 Problem 27

The natural line width $\Lambda$ is
$\begin{align*}\Gamma &= \frac{\hbar}{\tau} \\&= \frac{\hbar }{1.6 \cdot 10^{−9} s} \\&= h \cdot \frac{1}{2 \pi ...$
Therefore answer (C) is correct.

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