A rock is going to be analyzed for its radioactive isotope contents, X and Y. X is the parent and Y is the daughter isotope. Assume that the half-life of the radioactive isotopes is 5,730 years. Based on this information, answer the following two questions. A) How much of the parent (X) and how much of the daughter (Y) were present at the time the rock formed? Choose one of the following and explain why . A) X = 100 % ; Y = 100 % B) X = 0 % ; Y = 100 % C) X = 100 % ; Y = 0 % D) X = 50 % ; Y = 50 % B) How much of the parent (X) and how much of the daughter (Y) will be present after 5,730 years? Choose one of the following and explain why.
A) X = 75 % ; Y = 25 %
B) X = 50 % ; Y = 50 %
C) X = 25 % ; Y = 75 %
D) X = 12.5 % ; Y = 87.5%
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