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The half life of a radioactive substance is 20 minutes. The time taken between 50% decay and 87.5% decay of the substance will be |
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Answer» 10 minutes 87.5% decay `rarr 12.5%` remaining `therefore` time for 50% `rarr 25%` = 20min time of `25% rarr 12.5 = ul("20 min")` `ul("40 min")` |
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