Question

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50. The half life of a radioactive nuclide is 20 hrs. The fraction of the original activity that will remain after 40 hrs is
(A) 1/8
(C) 1/4
(D) 1/6
18) 1/2
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Answer 1

Answer:

40 hours means 2 half lives. So one fourth of the original activity will remain after 40 afters.