The Decay Constant of a Radioactive Isotope Is $1.60 \times 10 ^ { - 3 } \mathrm {~s} ^ { - 1 }$

question 105

Multiple Choice

The decay constant of a radioactive isotope is $1.60 \times 10 ^ { - 3 } \mathrm {~s} ^ { - 1 }$ . At a given instant, the number of atoms of the radioactive isotope is $1.85 \times 10 ^ { 12 }$ . How many atoms of the isotope remain after a time interval of $30.0$ minutes?

• A) \(1.14 \times 10 ^ { 11 }\)
• B) \(1.52 \times 10 ^ { 11 }\)
• C) \(1.26 \times 10 ^ { 11 }\)
• D) \(1.04 \times 10^{11}\)
• E) \(1.38 \times 10 ^ { 11 }\)

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