What is the half-life of a radioisotope if a 100 g sample becomes 50 g after 20 years?A.10 yearsB.20 yearsC.25 yearsD.50 years
Question
What is the half-life of a radioisotope if a 100 g sample becomes 50 g after 20 years?A.10 yearsB.20 yearsC.25 yearsD.50 years
Solution
The half-life of a radioisotope is defined as the time it takes for half of the isotope in a sample to decay. In this case, the 100 g sample has decayed to 50 g in 20 years. This means that the half-life of this radioisotope is 20 years. So, the answer is B. 20 years.
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