Strontium-90 has a half-life of 29 years. In how many years will a 1 kg sample of strontium-90 decay and reduce to 0.25 kg of strontium-90? Answer 58 years 116 years 87 years 29 years

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Strontium-90 has a half-life of 29 years. In how many years will a 1 kg sample of strontium-90 decay and reduce to 0.25 kg of strontium-90? Answer 58 years 116 years 87 years 29 years

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58 years. Use this expression: \[\ aA=Ae^{-kt} \] Where: A - is the initial amount (1 kg) a - percentage of A left after time t ( 0

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