What is the half-life of a radionuclide if 1/16 of its initial mass is present after 2 hours?

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**B.**
In every half-life, the mass decreases to half its previous value:

1/16 = 1/2^{4}

It takes four half-lives to decay down to 1/16 the original mass. Each must be 30 minutes long since the entire process takes two hours.

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