After three half lifes, the fraction of a radioactive material that has decayed is

After three half lifes, the fraction of a radioactive material that has decayed is
  • A.
    (frac{1}{8})
  • B.
    (frac{1}{3})
  • C.
    (frac{2}{3})
  • D.
    (frac{7}{8})
Correct Answer: Option D
Explanation

I = (frac{1}{2}) (Rightarrow) (frac{1}{4}) (Rightarrow) (frac{1}{8})
Fraction decayed = 1 – (frac{1}{8})
= (frac{7}{8})

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