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Unformatted text preview: (3). An atom can radiate at any time after it is excited. It is found that in a typical case the average excited atom has a life-time of about 10-8 sec, i.e., during this period, it emits a photon and is deexcited. Answer the following questions below, justifying your answers briefly: (a). What is the minimum uncertainty in the frequency of the photon? (b). Most photons from sodium atoms are in two spectral lines at about = 5890 A . What is the fractional width of either line, / . (c). Calculate the uncertainty E in the energy of the excited state of the atom?...
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