1.

The rate of decay of a radioactive substances* increases with increasing timeremains constant with increasing time* decreases exponentially with the increasing time*none of these

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Explanation:

The RATE of decay is often referred to as the activity of the isotope and is often MEASURED in Curies (Ci), one curie = 3.700 x 1010 atoms that decay/second. By KNOWING the amount of radioisotope and the activity of the SAMPLE, the rate constant can be DETERMINED.



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