The first excited state of 57 Fe decays to the ground state with the emission of a 14.4-kev photon in a mean lifetime of 141 ns. (Use values from this table.) (a) What is the width AE of the state? 81.77 x ev (b) What is the recoil kinetic energy of an atom of 57 Fe that emits a 14.4-kev photon? 80.77 x ev (c) If the kinetic energy of recoil is made negligible by placing the atoms in a solid lattice, resonant absorptions will occur. What velocity is required to Doppler-shift the emitted photon so that resonance does not occur? 1163.08 X mm/s Additional Materials M eBook

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