Question

5 of 15 A radioisotope tracer has a half-life of 2 minutes. If a level of <1% is considered safe, when would the soonest a sample injected with the tracer be safe to handle? about 2 minutes about 14 minutes about 99 minutes about 100 minutes 6 of 15 A reaction mechanism consisting of three steps, two fast and one slow, cannot be dependent on the slow step second order first order zero order

Answer 1

5 so t = 2 min = ln - = bez Since, level of L1 is considered sat, time required to reach , is Hoe om ontM * toliko 100 > t = 2 Inloo - 13.28 min enz at t= 13.28 min, N will be at ly of No NE = Not Numby of nucle at t time N = Number of nuclei ad t=0 So for time, a to 13.28 min, level of N will be less than 1%. So, time = about lymin

6.) Since, mechanism slow ne, mechanism involves two fast step and one w stel, so rate will be decided by slow Step. This mean rate will depend on cont of Concentrahon of some species. They fore, ita Can't be o order