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JEE Main 2022 · 29 Jun · Shift 2, Physics question 58

The half life of a radioactive substance is 5 years. After xx years a given sample of the radioactive substance gets reduced to 6.25% of its initial value. The value of xx is ______

Answer and worked solution

Official answer: 20

6.25% is 116\frac1{16}: four half-lives, 20 years.

Answer: 20

Topics:Radioactive decay
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