15 mg radioactive sample 90 disintegrate in 4 years 99 9

Last updated: 7/3/2023

15 mg radioactive sample 90 disintegrate in 4 years 99 9 disintegration will be in 90 afea atar m 15 mg af at 99 9 faufa A 4 years 4 f B 8 years 8 d C 12 years 12 ad D 16 years 16 Your Answer B