The Decay Constant of Radon-222 Is $0.181 \mathrm {~d} - 1$

question 20

Multiple Choice

The decay constant of radon-222 is $0.181 \mathrm {~d} - 1$ . If a sample of radon initially contains $6.00 \times 10 ^ { 8 }$ radon atoms, how many of them are left after $10.0 \mathrm {~d}$ ?

• A) \(8.56 \times 10 ^ { 8 }\)
• B) \(9.82 \times 10 ^ { 7 }\)
• C) \(8.34 \times 10 ^ { 8 }\)
• D) \(7.67 \times 10 ^ { 7 }\)
• Е) \(7.29 \times 10 ^ { 8 }\)

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