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

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detailed solution

Correct option is D

Undecayed isotope =1-78=18∴NN0=12t/T⇒18=12t/15⇒t15=3 or t= 45 hours.

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The half-life of the isotope Na 24 11 is 15 hrs. How much time does it take for 78th of a sample of this isotope to decay?

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