A radioactive element has a decay constant of 0.077s-1. Calculate its half-life
A
13.0s
B
9.0s
C
5.1s
D
0.5s
Verified Correct Answer: B.
Physical Principles & Numerical Solution
\(t_{\frac{1}{2}} = \frac{0.693}{\lambda} = \frac{0.693}{0.077} = 9s\)
Source: Myschool Past Questions Archive (Record #35113)