Radio waves

Definition

Radio waves are a type of electromagnetic radiation with wavelengths longer than infrared light. They are used widely in communication technologies, including radios, televisions, and cell phones.

5 Must Know Facts For Your Next Test

1. Radio waves have frequencies ranging from about 3 kHz to 300 GHz.
2. They are generated by oscillating electric currents, typically in antennas.
3. The speed of radio waves is the same as the speed of light in a vacuum, approximately $3 \times 10^8$ meters per second.
4. Radio waves can travel long distances and through various materials, making them ideal for broadcasting.
5. Different frequency ranges within the radio spectrum are allocated for different types of communication.

Review Questions

• What is the frequency range of radio waves?
• How are radio waves generated?
• Why are radio waves suitable for long-distance communication?

Related terms

Electromagnetic Spectrum:

The range of all types of electromagnetic radiation, from gamma rays to radio waves.

Antenna: A device used to transmit or receive electromagnetic waves.

Frequency:

The number of cycles per second in a wave, measured in Hertz (Hz).