Which layer of atmosphere helps in radio transmission?

The correct answer is Thermosphere.

Key Points

• The thermosphere layer of the Atmosphere helps in Radio Transmission.
• It is located above the mesosphere and below the exosphere.
• In the thermosphere, the temperature rises rapidly with increasing height.
• The ionosphere is a part of this layer. 
• This layer helps in radio transmission and in fact, radio waves transmitted from the earth are reflected back to the earth by this layer.
• This layer is home to the International Space Station as it orbits Earth. 

Additional Information The troposphere

• It is the lowermost layer of the atmosphere.
• Its average height is 13 km and extends roughly to a height of 8 km near the poles and about 18 km at the equator.
• The thickness of the troposphere is greatest at the equator because heat is transported to great heights by strong convectional currents.
• This layer contains dust particles and water vapor.
• All changes in climate and weather take place in this layer.
• The temperature in this layer decreases at the rate of 1°C for every 165m of height.
• This is the most important layer for all biological activity.

The stratosphere

• It is found above the tropopause and extends up to a height of 50 km.
• One important feature of the stratosphere is that it contains the ozone layer.
• This layer absorbs ultraviolet radiation and shields life on the earth from an intense, harmful form of energy.

The mesosphere

• It lies above the stratosphere, which extends up to a height of 80 km.
• In this layer, once again, the temperature starts decreasing with the increase in altitude and reaches up to minus 100°C at a height of 80 km.
• The upper limit of the mesosphere is known as mesopause.

The exosphere

• It is the uppermost layer of the atmosphere.
• This is the highest layer but very little is known about it.
• Whatever contents are there, these are extremely rarefied in this layer, and it gradually merges with outer space.