1.

._(84)^(218)Po(t_(1//2)=183 sec) decay to ._(82)Pb(t_(1//2)=161 sec) by alpha-emission, while Pb^(214) is a beta-emitter. In an experiment starting with 1 mole of pure Po^(218), how many time would be required for the number of nuclei of ._(82)^(214)Pb to reach maximum ?

Answer»

147.5
247.5
182
304

Answer :B


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