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Q.

A radioactive sample whose half-life is 40h has 18 times more activity than required for safety, then after how many half-lives will the radioactive sample will be safe?

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answer is 2.

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Detailed Solution

For safe level of radiation, activity should be smaller than R018.R025>R018>R024∴the number of half−lives needed for safe levels of radiation is 5.
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