<prompt> At t0 there are 6 x 1023 radioactive atoms of a substance, which decay with a disintegration constant k equal to 0.01sec. What would be the initial decay rate?6 x 10236 x 10226 x 10216 x 1020  <response>: All radioisotopes decay at a rate obeying the universal law of radioactive decay. This law states that the number of radioisotope nuclei within a population of N radioisotope nuclei decaying at any instant, is propoional to N, therefore Rate of decay k N k is the disintegration constant. k 0.01sec, N 61023 Rate of decay 0.01 61023 61021 Ref: Radioisotope Thin-Film Powered Microsystems By Rajesh Duggiral, Page 2 