The a Half-Life of 5,715 Years

question 12

Multiple Choice

The a half-life of 5,715 years.After 2,000 years, a sample of the isotope is reduced to 1.2 grams.What was the initial size of the sample (in grams) ? How much will
Remain after 20,000 years (i.e., after another 18000 years) ? Round your answers to four decimal
Places.

• A)1.0706 , 0.0947
• B)2.4471 , 0.2164
• C)1.5294 , 0.1352
• D)2.1412 , 0.1893
• E)1.9883 , 0.1758

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