Which of the following is the percentage of the original quantity of a radioactive material left after five half-lives approximately.
Correct answer: A. 3%
- A. 3%
- B. 10%
- C. 6.25%
- D. 20%
Explanation
After 5 half lives, the fractions of atoms remains is given by,N0/N =(1/2)t/T. Given that t=5T: N0/N =(1/2)5T/T =1/32=3% approximately
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