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The Decay Constant of a Radioactive Nuclide Is 3 10−310 ^{- 3}

Question 127

Multiple Choice

The decay constant of a radioactive nuclide is 3.1 x 10−310 ^{- 3} s−1\mathrm { s } ^ { - 1 } At a given instant,the activity of a specimen of the nuclide is 70 kBq.How much later has the activity declined to 10 kBq?


A) 630 s
B) 690 s
C) 750 s
D) 820 s
E) 880 s

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