Question

A radioactive element having decay constant to be $2.31\times {10}^{-3}$ per day is reduced to 25% of its initial amount in a period of ?

• A. 300 days
• B. 600 days
• C. 150 days
• D. 450 days

Answer 1

The correct option is B

600 days

$t=\frac{2.303}{\lambda }log\frac{100}{25}=\frac{2.303}{2.31\times {10}^{-3}}log2=600$ days