Chemistry
Laraechakra
2021-01-23 22:56:48
what fraction of a Sr-90 sample remains unchanged after 87.3 years?
ANSWERS
Hyperugrat
2021-01-24 01:28:51

Half life of Sr-90 is 28.8 years  so:  28.8 = ln 2/k  k = -0.0241  - 0.0241 x 87.3 = -2.10393 e^-2.10393 = 0.12 3/25 of the original sample will remain unchanged.

ADD ANSWER