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A sample of a radioactive substance decayed to 97% of its original amount after a year. (Round your answers to two decimal places. ) (a)

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A sample of a radioactive substance decayed to 97% 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 to 55% of its original amount? yr

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