56. Satellites used in a Global Positioning System (GPS) orbit around Earth, sending electromagnetic waves that GPS units in cars can use to determine their location on Earth. Which type of electromagnetic radiation is used to send information from the GPS satellites to receivers on Earth?
Answer: D
Microwaves are used to send information from GPS satellites to receivers on Earth.
GPS satellites communicate with receivers on Earth using microwaves, which have the appropriate wavelength to penetrate the atmosphere and facilitate accurate positioning.
A) X-rays
X-rays are a form of high-energy electromagnetic radiation that can penetrate most materials. However, they are not suitable for communication purposes due to their high energy and inability to effectively transmit signals over the long distances required for GPS functionality.
B) Ultraviolet radiation
Ultraviolet radiation is higher in energy than visible light and is primarily associated with effects such as sunburn. It is not used in GPS communication, as it does not efficiently penetrate the atmosphere and is absorbed by atmospheric gases, making it impractical for satellite communication.
C) Infrared radiation
Infrared radiation is used in various applications, such as remote controls and thermal imaging, but it is not effective for GPS signals. Infrared waves have longer wavelengths than microwaves, which limits their ability to transmit information over the necessary distances for GPS functionality.
D) Microwaves
Microwaves are the correct choice as they are specifically designed for communication systems, including GPS. They can travel long distances and penetrate the Earth's atmosphere effectively, allowing for precise location determination by GPS receivers.
Conclusion
Microwaves are the definitive choice for GPS communication, enabling effective transmission of signals from satellites to ground receivers. The other options, including X-rays, ultraviolet radiation, and infrared radiation, do not possess the necessary properties for efficient communication in the context of GPS technology, confirming that microwaves are the only suitable option.