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J 9. The half-life of Barium-139 is 4.96 x 10* seconds. A sample contains 3.21 x 10 nuclei. What is the decay constant for this

J 9. The half-life of Barium-139 is 4.96 x 10* seconds. A sample contains 3.21 x 10 nuclei. What is the decay constant for this decay? 1.67 x 1048 1 1.40 x 104 5 1 2.22 x 104 5-1 5.43 x 104s-1

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