The isotope cobalt-57 has a half-life of 272 d. How long will it take a sample of 57Co to decay to 38% of its original activity? | Kinetics | TheChemSolver

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Question

The isotope cobalt^-57 has a half-life of 272 d. How long will it take a sample of ⁵⁷Co to decay to 38% of its original activity?

A.

103 d

B.

337 d

C.

188 d

D.

380 d

✓ Correct

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