Which of the following reflects radio waves back to the Earth?

A. Ionosphere

B. Thermosphere

C. Tropopause

D. Mesopause

Answer: Option A

Solution(By Examveda Team)

Ionosphere reflects radio waves back to the Earth. The low-frequency end of the window is limited by signals being reflected by the ionosphere back into space, while the upper limit is caused by absorption of the radio waves by water vapor and carbon dioxide in the atmosphere. The ionized part of the Earth's atmosphere is known as the ionosphere.