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If is given that radium decomposes at a ...

If is given that radium decomposes at a rate proportional to the amount present. If `p %` of th original amount of radium disappears in `l` years, what percentageof it will remain after `2l` years?

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`(dA)/(dt)=-lambda A`
`int (dA)/(A)=int -lamda dt`
`log A=-lambda t+C`
when `t=l`,`p%` disappear
...
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