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What is the half-life period of a radioactive material if its activity drops to 1/16th of its initial value of 30 years ?

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What is the half-life period of a radioactive material if its activity drops to 1/16th of its initial value of 30 years ?

(A) 9.5 years

(B) 8.5 years

(C) 7.5 years

(D) 10.5 years

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Correct option is (C) 7.5 years

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