Question

The earth's atmosphere is divided into different layers. Out of these layers, ionosphere consists of

• A. only positive ions.
• B. only neutral particles.
• C. only electrons.
• D. electrons and positive ions.

Hint:

The ionosphere consists of charged particles including free electrons and positive ions, which are responsible for reflecting radio waves.

Answer 1

The Correct Option is D

Step 1: Understanding the ionosphere.
The ionosphere is a layer of the Earth's atmosphere that contains charged particles, including free electrons and positive ions. It is created by the ionization of gas molecules by solar radiation.
Step 2: Analyzing the options.
- (A) Only positive ions is incorrect because the ionosphere also contains free electrons. - (B) Only neutral particles is incorrect because the ionosphere is characterized by ionized particles, not neutral ones. - (C) Only electrons is incorrect because the ionosphere also contains positive ions. - (D) Electrons and positive ions is correct as the ionosphere contains both free electrons and positive ions.

Step 3: Conclusion.
The correct answer is (D), as the ionosphere consists of both electrons and positive ions.