The rate constant for a first order reaction is $7.0\times {10}^{-4} s^{-1}.$ If initial concentration of the reactant is 0.080 M, what is the half-life of the reaction?

• Correct answer
  A

  $990\sec$
• B

  $79.2\sec$
• C

  $10.10\times {10}^{-4}$ $\sec$
• D

  $12375\sec$

Hence, the correct answer is option: 'A'.