Q. The rate constant of a first order reaction whose half-life is 480 s is
A) $1.44\ s^{- 1}$
B) $1.44\ \times 10^{- 3}\ s^{- 1}$
C) $2.88\ \times 10^{- 3}\ s^{- 1}$
D) $0.72\ \times 10^{- 3}\ s^{- 1}$
Explanation
(b)
$k = \frac{0.693}{t_{1/2}} = \frac{0.693}{480}\ s^{- 1}$
$k = 1.44 \times 10^{- 3}\ s^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.