posted by bme1 .
does the half life formula t=ln2/k give sec as unit or min as unit
It depends upon what the half life is measured in. If the half life is 3.54 sec then k is in sec^-1. If half life is 4.5 min, then k is in min^-1. You may be asking the other way around (what unit for half life if k .....) but I think you gt the idea.