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

Question

${{\log 2} \over k}$

${{\log 2} \over {k\sqrt {0.5} }}$

${{\ln 2} \over k}$

${{0.693} \over {0.5k}}$

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