In a first-order reaction `A rarr B`, if `K` is the rate constant and initial concentration of the reactant is `0.5 M`, then half-life is

In a first order reaction, A rarrB , if K is rate constant and initial concentration of the reactant A is 0.7M then half - life is

In a first order reaction A to B , if k is rate constant and initial concentration o f the reactant A is 0.5 M then the half-life is

In a first order reaction A to B, if k is rate constant and initial concentration of the reactant A is 2 M then the half life of the reaction is: