The half-life of a radioactive substance is 10 days it means...

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The half-life of a radioactive substance is 10 days; it means there will be

A. Complete decay of substance in 20 days

B. Complete decay of substance in 40 days

C. Decay of $$\frac{3}{4}$$ part of substance in 20 days

D. Decay of $$\frac{1}{4}$$ part of substance in 5 days

Answer: Option C

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