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NDA Mathematics 10 April 2022
MCQ (Single Correct Answer)
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A radioactive substance decays at a rate proportional to the amount of substance present. If half of the substance decays in 100 years, then what is the decay constant (proportionality constant) ?
A
$\frac{\ln 2}{100}$
B
$\frac{\ln 5}{100}$
C
$\frac{\ln 10}{100}$
D
$\frac{2 \ln 2}{100}$
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