222 Rn decays by the emission of an a particle with a lifetime of 3.823 days. The...
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222Rn decays by the emission of an a particle with a lifetime of 3.823 days. The kinetic energy of the a particle is measured to be 5.490 MeV. What is the uncertainty in this energy? Describe in one sentence how the finite lifetime of the excited state of the radon nucleus translates into an energy uncertainty for the emitted a particle.
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