The selling rate of a radioactive isotope is decided by its activity.

Question:

The selling rate of a radioactive isotope is decided by its activity. What will be the second -hand rate of a one month old ${ }^{32} \mathrm{P}$ ( $\mathrm{t}_{1 / 2}=14.3$ days) source if it was originally purchased for 800 rupees?

Solution:

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