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A sample of a radioactive substance decayed to93.5%of its original amount after a year. (Round your answers to two decimal places.)(a) What is the half-life

A sample of a radioactive substance decayed to93.5%of its original amount after a year. (Round your answers to two decimal places.)(a) What is the half-life of the substance? yr (b) How long would it take the sample to decay to70%of its original amount? yr

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