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205Pb undergoes first-order radioactive decay with a half-life of 1.73107 years. Calculate the length of time required for 10% of a sample of 205Pb to

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205Pb undergoes first-order radioactive decay with a half-life of 1.73107 years. Calculate the length of time required for 10% of a sample of 205Pb to decompose. [5]

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