What type of electromagnetic wave is commonly used for satellite transmissions?

The correct answer is that microwaves are commonly used for satellite transmissions. Microwaves operate at specific frequencies that allow for effective transmission through the Earth’s atmosphere, especially at higher altitudes where satellites operate. These waves have the ability to penetrate the atmosphere with minimal attenuation, making them ideal for communication purposes, including transmitting data from satellites to ground stations.

Additionally, microwaves can carry a large amount of data without interference, which is essential for the high-bandwidth demands of satellite communications. They are also less prone to scattering compared to other types of electromagnetic waves, which can add to their effectiveness for long-distance communication.

While radio waves are used extensively for many types of communication, including some satellite communications, they are more commonly associated with lower-frequency transmissions, such as AM/FM radio. Infrared and ultraviolet waves, on the other hand, are not suitable for satellite communications due to their inability to penetrate the atmosphere effectively, limiting their distance and effectiveness for such applications.