*Question T3B09:
What frequency range is referred to as UHF?*  

*Correct Answer is  D: 300 to 3000 MHz*  

### AI Response: (may contain errors)  

The correct answer to the question about the UHF frequency range is:

**Correct Answer: D: 300 to 3000 MHz**

### Explanation:

1. **Why the correct answer is correct:**
   - UHF stands for Ultra High Frequency, which is defined by the Federal Communications Commission (FCC) as the frequency range from 300 MHz to 3000 MHz. This range is commonly used for television broadcasting, mobile phones, and other forms of wireless communication.

2. **Why the other choices are incorrect:**
   - **A: 30 to 300 kHz**: This range is classified as Low Frequency (LF), which is not part of the UHF spectrum.
   - **B: 30 to 300 MHz**: This range includes Very High Frequency (VHF) and does not reach the UHF range, which starts at 300 MHz.
   - **C: 300 to 3000 kHz**: This range is equivalent to 0.3 to 3 MHz, which falls under the Medium Frequency (MF) and High Frequency (HF) bands, not UHF.

### Useful Information:
- The electromagnetic spectrum is divided into various bands, and knowing these classifications helps in understanding radio communications.
- The UHF band is particularly important for line-of-sight communications due to its shorter wavelengths, which can be affected by obstacles.

In summary, UHF is specifically defined as 300 to 3000 MHz, making option D the only correct choice.