A Certain Radioactive Isotope Has a Lifetime of 343

question 67

Multiple Choice

A certain radioactive isotope has a lifetime of 343.6 s.Suppose you have a beam made of radioactive ions of this isotope travelling at 5.21 * 10⁷ m/s in the laboratory,circulating in a cyclotron.If you begin with a sample of 2.50 micro-moles of this isotope,how many atoms have you left after one hour?

• A)4.97 * 10¹³
• B)4.23 * 10¹³
• C)3.61 * 10¹³
• D)None are correct.

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