Half-life period of a first-order reaction is `1386` seconds. The specific rate constant of the reaction is

Options

A. `5.0 xx 10^(-2) s^(-1)`
B. `5.0 xx 10^(-3) s^(-1)`
C. `0.5 xx 10^(-2) s^(-1)`
D. `0.5 xx 10^(-3) s^(-1)`

Answer

D

Explanation

`k=(0.693)/(1386)=0.005=0.5xx10^(-3)s^(-1)`.