Calculate the half life of a first order reaction from their rate constants given below :
(a) `200" s"^(-1)` (b) `2" min"^(-1)` ( c ) `4" year"^(-1)`

Explanation

Half-life period of a first order reaction is given by `t_(1//2)=(0.693)/(k)`
(a) `t_(1//2)=(0.693)/(200" s"^(-1))=0.346xx10^(-2)s=3.46xx10^(-3)s`
(b) `t_(1//2)=(0.693)/(2" min"^(-1))=0.346" min"`
( c ) `t_(1//2)=(0.693)/(4" year"^(-1))=0.173" year"`