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A sample of a radioactive substance decayed to 90.5% 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 90.5% of its original amount after a year. (Round your answers to two decimal places.) (a) What is the half-life of the substance? 6.94 y yr (b) How long would it take the sample to decay to 5% of its original amount? yr Need Help

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