1 g of 90Sr gets converted to 0 953 g after...

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1 g of ⁹⁰Sr gets converted to 0.953 g after 2 yr. The half-life of ⁹⁰Sr, and the amount of ⁹⁰Sr remaining after 5 yr are

A. 1.44 yr and 0.916 g

B. 57.6 yr and 0.75 g

C. 28.8 yr and 0.887 g

D. 100 yr and 0.982 g

Answer: Option C

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