The half-life periof of a radioactive element is `40` days. If `32 g` of this element is stored for `160 days`, calculate the weight of the element that would remain in gram.

Answer

2

Explanation

Amount remaining after `n` half lives is
`=N_(0)/2^(n) (N_(0)= "initial amount")`
`=32/((2)^(4))=2 g [n= "number of half lives" =169/40 =4]`