Question

The half life period of $Pb^{210}$ is 22 years. If 2g of $Pb^{210}$ is taken, then after 11 years the amount of $Pb^{210}$ will be present i

• A. 0.1414.g
• B. 1.414 g
• C. 2.828 g
• D. 0.707 g

Answer 1

Answer: (B)

1.414 g

Answer 2

$t= \frac{t_{\frac{1}{2}}}{log \, 2}$ log $\left( \frac{N_0}{N} \right)$