MCQ
After how many seconds will the concentration of the reactants in a first order reaction be halved, if the decay constant is ${\rm{1}}{\rm{.155}} \times {\rm{1}}{{\rm{0}}^{{\rm{ - 3}}}}\,{\sec ^{ - 1}}$ ........... $\sec$
- A$100$
- B$200$
- C$400$
- ✓$600$