Multiple Choice
The half-life of protactinium-231 is 3.25 × 104 years. How long will it take for 10.4 grams of Pa-231 to decay to 2.6 grams?
A) 8.1 × 106 years
B) 4.0 × 105 years
C) 1.3 × 105 years
D) 6.5 × 104 years
E) 1.5 × 104 years
Correct Answer:
Verified
Correct Answer:
Verified
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