The excited state of a certain atom is 3.2 eV ± 0.21 eV. (h = 6.626 × 10-34 J ? s, 1eV = 1.60 × 10-19 J)
(a) What is the average lifetime of this state, in femtoseconds?
(b) If the excited energy were doubled (to 6.4 eV ± 0.21 eV), how would the lifetime be affected?
(a) 3.1 fs (b) unchanged since the uncertainty is still ± 0.21 eV
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