Q. The rate constant for a first order reaction whose half-life, is 480 s is
A) $2.88 \times 10^{- 3}s^{- 1}$
B) $2.72 \times 10^{- 3}s^{- 1}$
C) $1.44 \times 10^{- 3}s^{- 1}$
D) $1.44s^{- 1}$
Explanation
(c)
We know that,
$t_{1/2} = \frac{0.693}{k}$
$or\ k = \frac{0.693}{t_{1/2}} = \frac{0.693}{480}$
$= 1.44 \times 10^{- 3}s^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.