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Question

The radioactive nuclide 63Ni decays by a first-order process via the emission of a beta particle. The 63Ni nuclide has a half-life of 100. years. How long will it take for 71% of 63Ni to decay?
A) 49.4 years
B) 21.5 years
C) 0.858 years
D) 179 years
E) 77.6 years

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