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The half life of a radioactive substance is 5 years. After x years a given sample of the radioactive

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The half life of a radioactive substance is 5 years. After x years a given sample of the radioactive substance gest reduced to 6.25% of its initial value of x is ____.

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Correct answer is 20

T1/2 = 5 year

Time = 4 half lives = 20 years

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