Word Count : 202

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To calculate the spectral line width in Hertz, we need to relate it to the lifetime of the excited state via the uncertainty principle: [ \Delta E \cdot \Delta t \sim \hbar ] Here, (\Delta E) is the energy uncertainty of the state, (\Delta t) is the lifetime of the _________ ________ _________ ______ ___ ________ _________.
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