The Mean Life (Time Constant) of Radon-222 Is $5.526 \mathrm {~d}$

question 148

Multiple Choice

The mean life (time constant) of radon-222 is $5.526 \mathrm {~d}$ . 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) \(8.34 \times 10 ^ { 8 }\)
• B) \(7.29 \times 10 ^ { 8 }\)
• C) \(9.82 \times 10 ^ { 7 }\)
• D) \(7.67 \times 10 ^ { 7 }\)
• E) \(8.56 \times 10 ^ { 8 }\)

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Definitions:

Stale Checks

Checks that have not been cashed or deposited within a certain period, typically six months, and may not be honored by a bank.

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Postdated Checks

Checks written with a future date, implying they cannot be cashed or deposited until that date arrives.

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A situation where one's bank account does not have enough money to cover checks or electronic transfers made against it, potentially resulting in a bounced check or declined transactions.