High frequency waves are

Options

A. absorbed by F layer
B. reflected by the E layer
C. capable of use for long distance transmission
D. affected by the solar cycle

Answer

To solve the question regarding high frequency waves, we can follow these steps:

### Step-by-Step Solution:

1. **Understand High Frequency Waves**:
- High frequency (HF) waves are electromagnetic waves that typically range from 3 MHz to 30 MHz. They are known for their ability to travel long distances.

2. **Identify the Uses of High Frequency Waves**:
- High frequency waves are primarily used in long-distance communication. This is due to their ability to reflect off the ionosphere, which allows them to cover greater distances than lower frequency waves.

3. **Learn about Ionospheric Reflection**:
- The ionosphere is a layer of the Earth's atmosphere that is ionized by solar and cosmic radiation. It consists of several layers, including the E layer, which is particularly important for HF communication.

4. **Determine the Role of the E Layer**:
- The E layer of the ionosphere reflects high frequency waves back to the Earth, enabling long-distance communication. This reflection is crucial for radio communications, especially in amateur radio and aviation.

5. **Evaluate the Options**:
- With the understanding that high frequency waves are reflected by the E layer of the ionosphere, we can now check the provided options (A, B, C, D) to find the correct answer.

6. **Select the Correct Answer**:
- Upon reviewing the options, we find that option B states that "high frequency waves are reflected by the E layer of ionosphere." This aligns with our understanding and is therefore the correct answer.

### Final Answer:
- **Option B**: High frequency waves are reflected by the E layer of the ionosphere.

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