Question

Disintegration constant for a radioactive substance is $0.58$ per hour. Its half-life period is:

• A. 8.2 h
• B. 5.2 h
• C. 1.2 h
• D. 2.4 h

Answer 1

Answer: (C)

$t_{1/2}=0.693/\lambda$
Given, $\lambda =0.58h^{-1},$
$\lambda =?$
$t_{1/2}=\frac{0.693}{0.58}$
$=1.19h$
$=1.2h$