A radioactive element has a decay constant of 0.077s-1, calculate its half life
A
12.5s
B
9.0s
C
5.1s
D
0.5s
Verified Correct Answer: B.
Physical Principles & Numerical Solution
T = \(\frac{0.692}{\lambda} = \frac{0.692}{0.077}\)
= 9s
Source: Myschool Past Questions Archive (Record #34240)