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[8 marks} 2. A sample of a radioactive substance decayed to F893 of its original amount after 3 years. H marks} a. 1What is the

[8 marks} 2. A sample of a radioactive substance decayed to F893 of its original amount after 3 years. H marks} a. 1What is the half-life of the substance? H marks} 13. How long would it take the sample to decay to 40% of its original amount?I

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