The half life period of a radioactive substance is 60 days. The time taken for 7 8 th of its original mass to disintegrate will be :

Question

The half life period of a radioactive substance is 60 days. The time taken for 7 8 th of its original mass to disintegrate will be :, 120 days, 130 days, 180 days, 20 days

MARKS App · Accepted Answer

Given half life period of a radioactive substance is t 1 2 = 60 days. Here, 7 8 th of radioactive substance disintegrates means 1 8 th remains or 1 2 3 . ∴ 3 half lives = 3 × 60 = 180 days

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