Radio waves are reflected from which layer of atmosphere ?

Options

A. Mesosphere
B. Chromosphere
C. Ionosphere
D. None.

Answer

To solve the question "Radio waves are reflected from which layer of atmosphere?", we can follow these steps:

### Step 1: Understand the Question
We need to identify which layer of the atmosphere is responsible for reflecting radio waves.

**Hint:** Think about the different layers of the atmosphere and their properties related to radio wave propagation.

### Step 2: Review the Layers of the Atmosphere
The atmosphere is divided into several layers:
- Troposphere
- Stratosphere
- Mesosphere
- Thermosphere
- Ionosphere

**Hint:** Recall the characteristics of each layer, especially their ability to reflect or absorb different types of waves.

### Step 3: Identify the Role of the Ionosphere
The ionosphere is a region of the atmosphere that is ionized by solar and cosmic radiation. It plays a crucial role in radio wave propagation, particularly in sky wave propagation.

**Hint:** Consider how the ionization in the ionosphere affects the transmission of radio waves.

### Step 4: Understand Sky Wave Propagation
Sky wave propagation occurs when radio waves are transmitted from a ground station, reflect off the ionosphere, and return to Earth, allowing for long-distance communication.

**Hint:** Think about how the frequency of radio waves relates to their ability to be reflected by the ionosphere.

### Step 5: Conclusion
Based on the information gathered, we conclude that radio waves are reflected from the **ionosphere**.

**Final Answer:** The correct answer is the **ionosphere**.

### Summary
Radio waves are reflected from the ionosphere, which is the layer of the atmosphere that facilitates sky wave propagation, allowing for long-distance radio communication.