So the graph below shows the radioactive decay of two materials. which of these statements is correct about material 1 and material 2? a. the half-lives of material 1 and material 2 are same. b. the half-life of material 2 is one-fourth of the half-life of material 1. c. the half-life of material 2 is 5 years more than the half-life of material 1. d. the half-life of material 1 is 5 years more than the half-life of material 2.