*Question G3B10:
What is the approximate maximum distance along the Earth’s surface normally covered in one hop using the E region?*  

*Correct Answer is  B: 1,200 miles*  

### AI Response: (may contain errors)  

The E region of the ionosphere is one of the layers that can reflect radio waves back to Earth, allowing for long-distance communication. The maximum distance that can be covered in one hop using the E region is determined by the height of the E layer and the angle at which the radio wave is transmitted.

1. **Correct Answer: 1,200 miles (Choice B)**
   - The E region typically allows for a maximum single-hop distance of approximately 1,200 miles. This is due to the height of the E layer, which is around 60 to 90 miles above the Earth's surface, and the typical angles of incidence for radio waves.

2. **Why the Other Choices are Incorrect:**
   - **180 miles (Choice A):** This distance is too short for a single hop using the E region. It might be more typical for ground wave propagation or very low-angle skywave propagation.
   - **2,500 miles (Choice C):** This distance is more typical for the F region, which is higher in the ionosphere and can support longer single-hop distances.
   - **12,000 miles (Choice D):** This distance is far too long for a single hop using any ionospheric layer. It would require multiple hops or satellite communication.

3. **Useful Rule of Thumb:**
   - The maximum distance for a single hop using the E region is generally around 1,200 miles. This is a useful figure to remember for exam purposes and practical radio operation.