Radioactive decay to 1/32 initial: number of half-lives:

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(1/2)ⁿ = 1/32 ⇒ 2ⁿ = 32 ⇒ n = 5 half-lives. Exponential decay calculation. Memory aid: '1/2ⁿ remaining; 1/32 = 1/2⁵ ⇒ 5 half-lives'. Radioactivity arithmetic frequently tested in competitive exams.

Radioactive decay to 1/32 initial: number of half-lives: MCQ with Answer and Explanation

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