Word Count : 212

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The linewidth of an excited state is related to its lifetime through the energy-time uncertainty principle: [ \Delta E \cdot \Delta t \approx \hbar ] Here, (\Delta t = \tau = 1.52 \times 10^7 , \text{s}) and (\hbar = \frac{h}{2\pi} \approx 1.055 ________ _________ _______ _________ ____ ____ ________ ___ ____.
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