Atoms And Nuclei Question 375
Question: The half-life of a radioactive isotope ‘X’ is 50 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y were found to be in the ratio of 1:15 in a sample of a given rock. The age of the rock was estimated to be
Options:
A) 150 years
B) 200 years
C) 250 years
D) 100 years
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Answer:
Correct Answer: B
Solution:
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Let number of atoms in
By question
So, total 4 half-lives are passed, so, age of rock is
