Suppose we consider a large number of continers each containing initially `10000` atoms of a radioactive material with a half life of `1` year. After `1` year.

Options

A. all the containers will have 5,000 atoms of the material.
B. all the containers will contain the same number of atoms of the material but that number will only be approximately 5,000.
C. the containers will in general have different numbers of the atoms of the material but their average will be close to 5,000.
D. none of the containers can have more than 5,000 atoms.

Explanation

Given the half-life of radioactive material is one year, this implies that after one year, on the average, half of the atoms will decay. So, the containers will in general have different number of atoms of the material but their average will be close to 5,000. The correct option is (c).