MHT CET 2026 Physics question
Activity of a radioactive sample decreases to of its original value in 4 days. Then in 16 days its activity will become x times the original value. The value of x is
Answer: (C)
Solution
Activity falls as . A fall to in 4 days means 2 half-lives in 4 days, so days. In 16 days the number of half-lives is , so , option (C). Alternatively, each 4-day interval
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