what is the uncertainty in energy of this excited state? What is the width of the corresponding spectral line?

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A sodium atom makes a transition from the first excited state to the ground
state, emitting a 589.0-nm photon with energy 2.105 eV. If the lifetime of this excited state is 1.6 × 10−8 s , what is the uncertainty in energy of this excited state? What is the width of the corresponding spectral line?

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