1.

Initial mass of a radioactive element is 40 g. How many grams of it would be left after 24 years, if its half-life period is 8 years

Answer»

2
5
10
20

Solution :`N = (N_(0))/(2^(n)) and n = (24)/(8) = 3`
`N = (40)/(2^(3)) = (40)/(8) = 5`


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