Multiple choice

Directions: Choose the appropriate answer from the options given below:

The radio waves which were transmitted from the earth are reflected back to earth by

  1. mesosphere

  2. ionosphere

  3. stratosphere

  4. troposphere

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ionosphere, located in the upper atmosphere (approximately 60-1000 km altitude), contains ionized particles that reflect radio waves back to Earth, enabling long-distance radio communication. This property is crucial for AM radio broadcasting and other communication technologies. The other layers (troposphere, stratosphere, mesosphere) do not have sufficient ionization to reflect radio waves effectively.