Question

Radio waves transmitted from the earth are reflected back to the earth from this layer of the atmosphere

• A. Exosphere
• B. Mesosphere
• C. Stratosphere
• D. Thermosphere

Hint:

The Ionosphere, a region within the thermosphere, is crucial for radio communication due to its ability to reflect radio waves, enabling signals to travel beyond the line of sight.

Answer 1

The Correct Option is D

Step 1: Understand the question about radio wave reflection.
The question asks which layer of the atmosphere is responsible for reflecting radio waves back to Earth. This phenomenon is crucial for long-distance radio communication.

Step 2: Recall the characteristics of atmospheric layers relevant to radio waves.
Exosphere: The outermost layer, where the atmosphere thins out into space. It has very few particles and is not primarily known for reflecting radio waves.
Mesosphere: Located above the stratosphere and below the thermosphere. While some ionization occurs here, it's not the primary layer for consistent radio wave reflection.
Stratosphere: Located above the troposphere, containing the ozone layer. It does not play a significant role in reflecting radio waves.
Thermosphere: This layer contains a region called the Ionosphere. The ionosphere is characterized by a high concentration of free electrons and ions, which are produced by solar radiation. These charged particles are capable of reflecting radio waves of certain frequencies back to Earth, allowing for long-distance radio communication.

Step 3: Conclude the correct atmospheric layer.
The ionosphere, which is a part of the thermosphere, is the primary layer responsible for reflecting radio waves back to Earth.