The Radiochemist, Will I $\alpha$ Particles in One Year

question 41

Multiple Choice

The radiochemist, Will I. Glow, studied thorium-232 and found that 2.82 *10¯⁷ moles emitted 8.42 *10⁶ $\alpha$ particles in one year. What is the decay constant for thorium-232?

• A) 3.35 * 10¯¹⁴ yr¯¹
• B) 4.96 *10¯¹¹ yr¯¹
• C) 1.40 * 10¹⁰ yr¯¹
• D) 2.99 * 10¹³ yr¯¹
• E) None of these choices is correct.

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