Molecules of a toxic chemical eventually decompose into inert substances. suppose the decomposition time is exponentially distributed with a mean of 1/lambda. the half-life of such a persistent poison is that time beyond which the probability is .50 that a particular molecule will remain toxic. find the half-life for chemicals whose molecules have an average decomposition time of (a) 6 yearshalflife= ? years(b) 40 yearshalflife= years(c) 344 yearshalflife= ? years(d) 5584 yearshalflife= ? years