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

Correct Answer: Option B

B. 9.0s

Explanation

t½ = 0.693/λ = 0.693/0.077

=9s