What happens when neutron reproduction factor is greater than one?

Explanation

### Step-by-Step Solution:

1. **Understanding Neutron Reproduction Factor**:
The neutron reproduction factor (k) is defined as the ratio of the number of neutrons produced in one generation of a nuclear reaction to the number of neutrons that initiate the reaction. Mathematically, it can be expressed as:
\[ k = \frac{N_{produced}}{N_{initiated}} \]
where \(N_{produced}\) is the number of neutrons produced and \(N_{initiated}\) is the number of neutrons that started the reaction.
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