13.A sample of a radioactive substance undergoes 80% decomposition in 345minutes.Its half life is 1)ln2/ln5345min 2)ln5/ln2345min 3)ln5/ln4345min 4)ln4/ln5345min

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13.A sample of a radioactive substance undergoes 80% decomposition in 345minutes.Its half life is 1)ln2/ln5*345min 2)ln5/ln2*345min 3)ln5/ln4*345min 4)ln4/ln5*345min

13.A sample of a radioactive substance undergoes 80% decomposition in 345minutes.Its half life is 1)ln2/ln5345min 2)ln5/ln2345min 3)ln5/ln4345min 4)ln4/ln5345min