The Decay Constant of a Radioactive Nuclide Is $3.1 \times 10 ^ { - 3 } \mathrm {~s} ^ { - 1 }$

question 93

Multiple Choice

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

• A) \(880 \mathrm {~s}\)
• B) \(690 \mathrm {~s}\)
• C) \(630 \mathrm {~s}\)
• D) \(750 \mathrm {~s}\)
• E) \(820 \mathrm {~s}\)

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