*Question G3B09:
What is the approximate maximum distance along the Earth’s surface normally covered in one hop using the F2 region?*  

*Correct Answer is  C: 2,500 miles*  

### AI Response: (may contain errors)  

The F2 region of the ionosphere is the highest and most dense layer, which allows radio waves to travel long distances by refracting them back to Earth. This is particularly useful for long-distance communication on HF bands.

1. **Correct Answer: 2,500 miles (C)**  
   - The F2 region can refract radio waves over very long distances. The typical maximum distance for a single hop (one reflection off the ionosphere) using the F2 region is approximately 2,500 miles. This is due to the height and density of the F2 layer, which allows for greater bending of radio waves compared to other ionospheric layers.

2. **Why Other Choices Are Incorrect:**
   - **180 miles (A):** This distance is too short for the F2 region. Such a short hop might be more typical of ground wave propagation or lower ionospheric layers like the D or E regions.
   - **1,200 miles (B):** While this distance is possible, it is more typical of the E region or a shorter F2 hop. The F2 region can achieve much longer distances.
   - **12,000 miles (D):** This distance is too long for a single hop. It might be achievable with multiple hops, but not with just one reflection from the F2 region.

3. **Useful Rule of Thumb:**
   - The F2 region is capable of supporting long-distance communication, typically up to about 2,500 miles per hop. For even longer distances, multiple hops are required, where the signal bounces between the ionosphere and the Earth's surface multiple times.