After three half lifes, the fraction of a radioactive material that has decayed is
PHYSICS
JAMB 1992
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: D. \(\frac{7}{8}\)
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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