It t_(1//2) of A is 1000 yrs, then 'A' left after t=2000 years

1.	It t_(1//2) of A is 1000 yrs, then 'A' left after t=2000 years
Answer» 0.5 0.25 0.125 0.06725 Solution :`N=(2000)/(1000)=2` `N_(0)=100` `N=(N_(0))/(2^(n))=(100)/(2^(2))` `=(100)/(4)=25%`

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