JEE PHYSICS MCQ: NUCLEI

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The half -life period of a radioactive substance is 20 days. What is the time taken for

(7 / 8)^{\text {th }}

of its original mass to disintegrate?

View answer and explanation

Correct option: B

60

days

Option B (

60

days) is correct because after 3 half-lives, (7/8)th of the substance will have disintegrated, which corresponds to 60 days.

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