What is the time needed for the activity of a radium-226 source to change from 1.5 Ci to 0.50 Ci? (The half-life of radium-226 is 1.60 * 103 y.)
A) 5.33 * 102 y
B) 1.60 * 103 y
C) 1.10 * 103 y
D) 9.36 * 102 y
E) 2.54 * 103 y
Correct Answer:
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