Essay
The excited state of a certain atom is 3.2 eV ± 0.21 eV. 
,1 eV = 1.60 × 10-19 J)
(a)What is the average lifetime of this state?
(b)If the excited energy were doubled to 6.4 eV ± 0.21 eV,how would the lifetime be affected?
Definitions:
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