Question

When Dr. Bruce Banner becomes angry and undergoes a transformation into the Incredible Hulk, his blood plasma becomes saturated with Na-24 atoms. These radioactive sodium atoms decay into stable Mg-24 by beta decay, along with the release of two high-energy gamma rays, to which Dr. Banner is immune. After initially becoming angry and transforming into the Hulk, how long will it take so that only 15% of the Na-24 atoms remain in his blood plasma? The half-life of Na-24 is 15 hours. O 15 hours 41 hours O 36 hours O 50 hours O 61 hours

Answer 1

Let , No= Initial amount of Plasma N=0.15 No Ty2 = 15 hrs. Let t= time at cohich N amount is bett. = N = No e - -0.046t d = la 2 = 0.oub キソ2 = 0.15 No = No é -0.046t = 0.15 en (0.15)= -1.897 =) - 0.0u6t: =) t = 41 hours Aus (Please rate it. Thank you !!!)