Radium-226, which undergoes a first order nuclear decay process to yield 222Rn, has a half-life of 1620 years. A 24.45 milligram sample of 226Ra was placed in a time capsule on January 1, 1932 with instructions to open the capsule and weigh it again on July 1, 2276. How many milligrams of the radium should be in the capsule at that time?
A) 21.85 milligrams
B) 21.10 milligrams
C) 19.25 milligrams
D) 20.14 milligrams
E) 21.65 milligrams
Correct Answer:
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