- #1

- 67

- 0

a How many half-lives does this take?

a 0.1% = 0.001, and 1/2^n = 1/1000

n = 10 or 10 half-lives

how did they get n=10

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- Thread starter dagg3r
- Start date

- #1

- 67

- 0

a How many half-lives does this take?

a 0.1% = 0.001, and 1/2^n = 1/1000

n = 10 or 10 half-lives

how did they get n=10

- #2

Alexander

2^{-x} = 0.001, so taking logarithm of both sides you get x = -log_{2}(0.001) = 3log_{2}(10)=3/log_{10}(2)=3/0.301 = 9.97 = 10

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