4.Strontium-90 is a radioactive isotope of Sr and has a half-life of 28.0 years. How long will it take for all the strontium-90 presently on earth to be reduced to 1.00%) of the present amount? Radioactive decay follows first-order kinetics. t: 0. 693 28=0.69a3 28K=0,693 R=0,00475 enTAコェ [A 2n C O49 9-owou4S + O.40Dyans [I ofer amtefl)

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