Which layer of atmosphere helps in radio transmission?

Correct option is B

The correct answer is (B) Thermosphere.

The thermosphere plays a critical role in radio transmission because it contains the ionosphere, a sublayer of the thermosphere. The ionosphere is made up of ionized particles, which can reflect and refract radio waves back to Earth, enabling long-distance communication.

Key points:

The ionosphere, within the thermosphere, is ionized by solar radiation, which creates a layer that can reflect radio signals, especially AM radio waves and shortwave radio signals, over vast distances.

This reflection allows radio transmissions to travel beyond the line of sight, making global communication possible.

The ionosphere is highly variable depending on factors like solar activity and time of day.

Information Booster:

● The ionosphere is critical for radio wave propagation and allows radio stations to broadcast signals over long distances.
● Different layers of the ionosphere reflect different frequencies of radio waves, making it possible for various types of communication, including amateur radio and military communication.
● The thermosphere is also where the auroras (Northern and Southern Lights) occur, due to the interaction of solar wind with Earth's magnetic field and ionized particles in the atmosphere.
● Satellites orbit in the thermosphere, where the atmospheric density is low.