A) 93.75%
B) 75%
C) 25%
D) 6.25%
Correct Answer: A
Solution :
Number of half lives in 20 min = n \[=\frac{20}{5}=4\] Fraction of material remains after four half lives \[=\frac{1}{16}\] Hence fraction that decays \[=1-\frac{1}{16}=\frac{15}{16}=93.75%\]You need to login to perform this action.
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