What is the ratio of un-decayed and decayed nuclei of a radioactive element after 3 half-lives have elapsed?
Correct answer: A. 1/7
- A. 1/7
- B. 7/8
- C. 7
- D. 8/7
Explanation
NR = No(1/2n) and ND = No (2n -1)/2nNR/ND = (1/8) x (8/7)= 1/7Thus, option 'A' is correct.
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