1.

A radioactive isotope has a half-life of 20 days. If 100 g of the substance is taken, the weight of the isotope remaining after 40 days is

Answer»

25 g
2.5 g
60 g
40 g

Solution :`N = (40)/(20) = 2`
`:.` Amount LEFT `(N_(0))/(2^(n)) = (100)/(2^(2)) = 25g`


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