A 5kg sample of plutonium-239 has a half-life of 21,400 years by emitting a 5.157 MeV (million or mega electron volts) alpha particles. Assume that the rate of decay is constant, how long will it take for the sample to degrade to 4.5kg? Ot*2580 years O t*3201 years Ot*3253 years Ot*2500 years none of the choices h

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