The half-life of 90Sr is 28 years. How long is required for the level of radioactivity to drop to 1.5% of its initial value? | Kinetics

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The half-life of ⁹⁰Sr is 28 years. How long is required for the level of radioactivity to drop to 1.5% of its initial value?

0.42 years

40 years

55 years

170 years

✓ Correct

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