Question: Radon - 2 2 2 decays by emitting an alpha particle with a lifetime of 3 . 8 2 3 days. The kinetic energy of

Radon-222 decays by emitting an alpha particle with a lifetime of 3.823 days. The kinetic energy of the
alpha particle is measured to be 5.490 MeV. What is the uncertainty in this energy? How does the finite
lifetime of the excited state of the radon nucleus translate into an energy uncertainty for the emitted alpha
particle?

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