What is the frequency range of radio frequency (RF) waves?

What is the frequency range of radio frequency (RF) waves?

• A. 3 Hz to 300 kHz
• B. 3 kHz to 300 GHz
• C. 30 Hz to 3 GHz
• D. 300 kHz to 3 GHz

Answer: (B)

RF waves span roughly from a few kilohertz up to hundreds of gigahertz. This range starts around 3 kHz, where long-wave and some low-frequency communications live, and extends up to 300 GHz, which covers the microwave portions used by radar, Wi‑Fi, satellite links, and other high-frequency applications. So, ranges that stop well below 3 kHz miss many RF signals, and ranges that cap at 300 kHz or 3 GHz omit significant higher-frequency bands still considered RF. That's why the full RF span is 3 kHz to 300 GHz.

RF waves span roughly from a few kilohertz up to hundreds of gigahertz. This range starts around 3 kHz, where long-wave and some low-frequency communications live, and extends up to 300 GHz, which covers the microwave portions used by radar, Wi‑Fi, satellite links, and other high-frequency applications. So, ranges that stop well below 3 kHz miss many RF signals, and ranges that cap at 300 kHz or 3 GHz omit significant higher-frequency bands still considered RF. That's why the full RF span is 3 kHz to 300 GHz.