Radio waves are a type of electromagnetic wave with the longest wavelengths and lowest frequencies in the electromagnetic spectrum. They are used primarily for wireless communication.
Key Characteristics:
- Frequency Range:
Radio waves typically range from about 3 kilohertz (kHz) to 300 gigahertz (GHz). - Wavelength Range:
Their wavelengths range from thousands of meters to about 1 millimeter, depending on the frequency. - Low Energy:
Radio waves have the lowest energy among electromagnetic waves, making them non-ionizing and safe for everyday use. - Propagation:
They can travel long distances, bounce off the ionosphere, or diffract around obstacles, which makes them ideal for broadcasting and communication. - Uses:
- AM and FM radio broadcasting
- Television signals
- Mobile phones
- Wi-Fi and Bluetooth
- Two-way radios (walkie-talkies)
- Satellite communication