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The element does, however, have a very long half-life (7.92 billion years, or 7.92E9 years). If a Stone originally contained
1-137, with 53 protons, undergoes beta minus decay. The daughter atom then undergoes beta minus decay again. Which of the fol
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Answer #1

Use the half life to find the decay constant and use that to find the required number of atoms after given time as shown below1) decay constant a = en 2 ta/2 - en 2 7.928109 y 8.75 X10-11 y2 N = No erat 1) 6.52 x 1024 )e -(875*10-48 43)(23-8X100y) 11

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