Two radioactive elements X and Y have half-lives of 100 and 50 years respectively. Samples of X and Y initially contain equal number of atoms. What is the ratio of the number of the remaining atoms of X to that of Y after 200 years?
A. 4:1
B. 3:1
C. 1:1
D. 1:2
E. 1:4
Correct Answer:
Option D – 1:2
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![The number of sulphur atoms in 3.20g of SO2(g) is [O = 16.0;S = 32.0; Avogadro constant = 6.02 X 10²³]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "The number of sulphur atoms in 3.20g of SO2(g) is [O = 16.0;S = 32.0; Avogadro constant = 6.02 X 10²³]")
