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Question: The half life of the isotope $_{11}N{a^{24}}$is 15 hrs. How much time does it take for $\frac{7}{8}th$ of a sample of this isotope to decay

1) 75 hrs

2) 65 hrs

3) 55 hrs

4) 45 hrs

Solution:

Explanation: No Explanation

Radioactivity Modern Physics

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