Answer :

Final answer:

The number of U-235 atoms affects the fission percentage as more atoms increase the possibility of a chain reaction. A larger sample maintains neutron interactions, leading to more fissions. Critical mass is needed to ensure sufficient fission occurs without neutron escape.


Explanation:

Understanding the Relationship Between U-235 Atoms and Fission

The number of U-235 atoms in a sample has a direct impact on the likelihood of fission occurring among those atoms. U-235 is a fissionable isotope, and when bombarded with neutrons, it can undergo a reaction that releases energy and produces additional neutrons. This is crucial in a nuclear chain reaction.

1. When a neutron collides with a U-235 nucleus, it can cause fission to happen, resulting in the formation of two smaller nuclei and the release of neutrons.
2. Each fission reaction produces two to three neutrons, which can then collide with other U-235 nuclei, causing them to fission as well. This spread of fission reactions continues as long as the neutrons remain contained within the material and do not escape.

3. However, if the sample of U-235 is too small, many of the neutrons may escape, and not enough will interact to sustain a chain reaction. This is why a critical mass of U-235 is needed to maintain a chain reaction where a larger percentage of U-235 atoms are fissioned.

In essence, the greater the number of U-235 atoms, the more potential there is for fission reactions to occur, leading to a higher percentage of U-235 atoms being fissioned when a proper arrangement and critical mass are achieved.


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