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The Radiochemist, Will I α\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 α\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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