Pixel:

http://prntscr.com/hd55rf

2 weeks ago
Pixel:

@Shadow

2 weeks ago
Shadow:

Half life = 15hours Time interval = 90hours Substance = 900grams How many half lives will it undergo \[\frac{ 90 }{ 15 } = 6\] It will undergo six half-lives. Therefore, we take 900 and do the following \[900 \rightarrow 450 \rightarrow 225 \rightarrow 112.5 \rightarrow 56.25 \rightarrow 28.125 \rightarrow 14.0625\]

2 weeks ago
Shadow:

We basically divide it in half, six times.

2 weeks ago
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