If `X` is the total number of collisions that a gas molecule registers with other molecules per unit time under particular conditions, then what is the collision frequency of the gas containing `N` molecules per unit volume is ?

Explanation

To find the collision frequency of a gas containing `N` molecules per unit volume, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Collision Frequency**:
- Collision frequency is defined as the total number of collisions per unit time that a single molecule experiences with other molecules in a gas.

2. **Identify Given Variables**:
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