The radio waves of frequency ranging from 2 MHz to 30 MHz are called

Options

A. Sky waves
B. Ground waves
C. Space waves
D. None of these

Answer

To solve the question regarding the classification of radio waves with frequencies ranging from 2 MHz to 30 MHz, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Radio Waves**:
- Radio waves are electromagnetic waves with frequencies that can vary widely. They are used for various forms of communication, including radio and television broadcasting.

2. **Identifying the Frequency Range**:
- The question specifies a frequency range of 2 MHz to 30 MHz.

3. **Knowing the Ionosphere**:
- The ionosphere is a layer of the Earth's atmosphere that is capable of reflecting radio waves back to the Earth's surface. This reflection is crucial for long-distance communication.

4. **Frequency Reflection by Ionosphere**:
- The ionosphere reflects radio waves within a certain frequency range, typically from a few megahertz up to about 40 MHz.

5. **Classifying the Waves**:
- The radio waves that fall within the frequency range of 2 MHz to 30 MHz are reflected by the ionosphere, making them suitable for long-distance communication.

6. **Naming the Waves**:
- The radio waves that are reflected by the ionosphere and fall within this frequency range are commonly referred to as "sky waves."

7. **Final Answer**:
- Therefore, the radio waves of frequency ranging from 2 MHz to 30 MHz are called **sky waves**.