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Rubidium-87 Decays by Beta Decay with a Half-Life of 4

Question 54

Multiple Choice

Rubidium-87 decays by beta decay with a half-life of 4.9 × 1010 yr.How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3,500 disintegrations per hour?


A) 9.0 × 1016 atoms
B) 4.3 × 10-4 atoms
C) 2.2 × 1018 atoms
D) 2.5 × 1014 atoms
E) 1.7 × 1014 atoms

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