Question

Indium-116 is radioactive and has a half life of 14.10 seconds. How long would it take a sample to decay from 7.70 mg to 900. g. Round your answer to 2 significant digits. x 5 ?

Answer 1

• Radioactive decay follows first oreder kineties ella (half life) of In-116 is 14:10 second s we know, rate I dissociation constant (a) = 0.693 ..^= 0.693 second-'-0.049 sec 14.10 Initial concentration (Co) - 7.70 mg. Final concentration (Ct) = 900 eug- 900 x 10 mg = 0.9 mg. as we know, Ct = co e - at (ttime) . or, an etleofat st -- en Ct I co — (1) peating the value in equation (1) to-b040 in 9:46 = 43.81 see It will take 43 81 second • Positron ir emitted from anna ... The balanced nuclear chemical equation La Na - > 32 ne tpe . . [Positron formula is e] Now, Pu 23