Question

The composition of gases in exosphere is
1. Helium and Hydrogen.
2. Neon and Oxygen.
3. Neon and Hydrogen.
4. Helium and Neon.

Answer 1

Correct Answer - Option 1 : Helium and Hydrogen.

The correct answer is Helium and Hydrogen.

• The exosphere is the outermost layer of the atmosphere.
• It starts above the ionosphere at a height of 400 km and stretches up to 10,000 km. 
• Light gases like helium and hydrogen float into space from here.
• The temperature in this layer gradually increases through the layer as the sunlight invades it.

• Gases in various layers of the atmosphere:
  • Troposphere - Nitrogen (78.08%), oxygen (20.95% ), argon (0.93% ), carbon dioxide (0.04%), methane, dinitrogenoxide, carbon monoxide, ozone, sulphate, nitrogen dioxide, and hydroxyl radical.
  • Stratosphere - Nitrogen, oxygen, argon, and trace elements like neon and helium.
  • Mesosphere -  Nitrogen, oxygen, and ozone.