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  3. the half-life of barium-139 is 4.96 x 103 seconds.

The half-life of Barium-139 is 4.96 x 103 seconds. A sample contains 3.21 x 107...

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The half-life of Barium-139 is 4.96 x 103 seconds. A sample contains 3.21 x 107 nuclei. What is the decay constant for this decay?2.22 x 10-4 s-11.40 x 10-4 s-11.67 x 10-4 S-15.43 x 10-4 s-1

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