Calculate the radial distance between two peaks in the radial probability of 2s orbital.

Explanation

To calculate the radial distance between two peaks in the radial probability distribution of the 2s orbital, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the 2s Orbital Structure**:
The 2s orbital has a radial probability distribution that consists of a central peak, a radial node, and another peak. This means that there are two points (peaks) in the radial probability distribution that we need to consider.

2. **Identify the Radial Distances**:
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