Mechanical (sound) waves are unable to travel through a vacuum, such as through space, but radio waves are transmitted to Earth from satellites. How is this possible?

Question

Responses
A Radio waves are electromagnetic waves.Radio waves are electromagnetic waves.
B Satellites are located within our atmosphere.Satellites are located within our atmosphere.
C Radio waves are very high energy mechanical waves.Radio waves are very high energy mechanical waves.
D Radio waves are changed to gamma rays for transmission.

Answer 1

The correct response is:

A. Radio waves are electromagnetic waves.

Radio waves are a type of electromagnetic wave, which means they can travel through a vacuum, such as space, unlike mechanical waves that require a medium (like air or water) to propagate.