Asked by Elsy

If the sample has a half life of 5 seconds, how much is left after 25 seconds?

12.5%

25%

3.125%**

6.25%

4 years ago

Answered by Elsy

The other choice was

1.5625%

4 years ago

Answered by R_scott

25 s is 5 half-lives

(1/2)^5 = 1/32

looks correct

4 years ago

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