A radioactive isotope has a decay constant of 10^-5s^4. Calculate half-life.

A. 6.93 x 10⁵s
B. 6.93 x 10⁵s
C. 6.93 x 10⁴s
D. 6.93 x 10⁴s

Correct Answer:

Option C – 6.93 x 10⁴s

Explanation

T½ = (0.693)/λ = (0.693)/10^-5

= 0.693 x 10⁵
= 6.93 x 10⁴sec