In UHF range the frequencies are propagated by means of :

Options

A. surface waves
B. sky waves
C. space waves
D. ground waves.

Answer

To solve the question regarding the propagation of frequencies in the UHF (Ultra High Frequency) range, we need to analyze the options provided and understand the characteristics of each type of wave propagation.

### Step-by-Step Solution:

1. **Understand UHF Range**:
- UHF stands for Ultra High Frequency, which typically ranges from 300 MHz to 3 GHz.

2. **Review the Options**:
- The options given are:
1. Surface wave
2. Sky waves
3. Space waves
4. Ground wave

3. **Analyze Surface Waves and Ground Waves**:
- Surface waves are also known as ground waves. They propagate along the surface of the Earth and are effective for frequencies below 2 MHz. Since UHF frequencies are above this range, these options are not suitable.

4. **Analyze Sky Waves**:
- Sky wave propagation involves the reflection of radio waves off the ionosphere. This type of propagation is effective for frequencies below 30 MHz. Since UHF frequencies exceed this range, sky waves are not applicable.

5. **Analyze Space Waves**:
- Space wave propagation occurs when radio waves travel directly from the transmitting antenna to the receiving antenna without reflecting off the ionosphere. This type of propagation is effective for frequencies ranging from 3 MHz to 30 GHz, which includes the UHF range.

6. **Conclusion**:
- Since UHF frequencies fall within the range suitable for space wave propagation, the correct answer is **Space waves**.

### Final Answer:
The frequencies in the UHF range are propagated by means of **Space waves**.

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