The amount of a radioisotope remaining undecayed after a... — Answer & Explanation | PrepBeePakistan

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HomeMCQsChemical Engineering

MEDIUMENGLISHChemical Engineering

The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be _____________ percent?

Correct answer: B

Explanation

After four half-lives, the remaining fraction is (1/2)^4 = 1/16. As a percentage, this is 6.25%.

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