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An element has an atomic mass 135.887u. This element is unstable and decays by alpha decay,...

An element has an atomic mass 135.887u. This element is unstable and decays by alpha decay, (α), with a half-life of 6.7days. The alpha particle is emitted with a kinetic energy of 2.8MeV. Determine the fraction present after 49.8hrs.

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