JEE Main · ChemistryMedium
A radioactive isotope decays with a half-life of . The time required for of the sample to decay is:
- A.
- B.
- C.
- D.
Show correct answer & step-by-step solution
Correct answer: C —
Solution
- Radioactive decay is a first order process.
- After one half-life, remains.
- After two half-lives, remains, meaning has decayed.
- Total time = .
- Hence the answer is (C).
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