Question

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

Answer 1

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.