Question on: JAMB Physics - 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
\(\frac{7}{8}\)
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Correct Option: D
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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