PHYSICS
JAMB 2016 - Question 32
Physics 2016 JAMB Past Questions - Question 32: A radioactive sample initially contains N atoms . After three half-lives the number of atoms that have disintegrated is
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
D
Explanation
After three half-lives, the number of atoms that have disintegrated can be calculated using the formula:
Number of atoms disintegrated = N * (1/2)^(number of half-lives)
Since you mentioned that the initial sample contains N atoms and three half-lives have passed, the number of atoms that have disintegrated would be:
Number of atoms disintegrated = N * (1/2)^3 = N * (1/8) = N/8
Therefore, after three half-lives, the number of atoms that have disintegrated is N/8.