Solution-The half-life of strontium-90 90sr is 25 years

Question: The half-life of strontium-90, ⁹⁰Sr, is 25 years. This means that half of any given quantity of ⁹⁰Sr will disintegrate in 25 years.

(a) If a sample of ⁹⁰Sr has a mass of 24 mg, find an expression for the mass that remains after t years.

(b) Find the mass remaining after 40 years, correct to the nearest milligram.

(c) Use a graphing device to graph m(t) and use the graph to estimate the time required for the mass to be reduced to 5 mg.

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