An engineering firm uses a radioactive isotope as an industrial tracer with a half-life of 4 hours.
A technician measures an initial count rate of 120 counts per second (cps) from this isotope.
Complete the graph on Figure 1, as accurately as possible, to show how the count rate of this isotope changes over a 16-hour period.
The first point at t=0t = 0t=0 is already plotted for you on Figure 1.
