Appeared in: 2026 (3 sets)
Half-life ($t_{1/2}$) of a first order reaction is $1386 \text{ s}$. The value of rate constant is :
(A) $0.5 \times 10^4 \text{ s}^{-1}$
(B) $5.0 \times 10^{-4} \text{ s}^{-1}$
(C) $0.5 \times 10^{-5} \text{ s}^{-1}$
(D) $0.5 \times 10^{-2} \text{ s}^{-1}$