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Question: 5 a sample with 40x1015 atoms has an activity of...

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5. A sample with 4.0x1015 atoms has an activity of 3.50x 1012 Bq. It has a half-life of 600 years. (a) How much is the decay constant? (2 marks) (b) How much time will it take to drop to one-quarter of its original amount? (2 marks)
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