The graph below shows the radioactive decay of a material whose half life is 25 years. graph with amount of radioactive material present (in grams) plotted on y axis and number of half-lives plotted on x axis. the points (0, 100), (1, 50), (2, 25), (3, 12.5), and (4, 6.25) have been joined using a smooth curve. in your own words, summarize the information provided by the graph about the radioactive decay of the material.