An electron in the n = 2 state of hydrogen remains there on average about 10-8s before

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An electron in the n = 2 state of hydrogen remains there on average about 10-8s before jumping to the n = 1 state.
(a) Estimate the uncertainty in the energy of the n = 2 state.
(b) What fraction of the transition energy is this?
(c) What is the wavelength, and width (in nm), of this line in the spectrum of hydrogen?
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