Math 12 Half Life help!!!
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Math 12 Half Life help!!!

[From: ] [author: ] [Date: 12-04-24] [Hit: ]
3)/(log.h = 8.......
Argh! This question is getting on my nerves. Help please?

11. A radioactive substance decays to 30% of its original mass in 15 months. Determine the half life of this radioactive substance to the nearest month.

Thanks! Any help appreciated...

-
A(t) = A(o)(1/2)^(t/h)

.3 = (1/2)^(15/h)

15/h = (log.3)/(log.5)

h = 15/[(log.3)/(log.5)]

h = 8.6357 ===> 9 months
1
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