Which statement accurately describes the frequency range of radio waves?

Which statement accurately describes the frequency range of radio waves?

• A. From 0 Hz to 3 kHz
• B. From 3 kHz to 300 GHz
• C. From 3 GHz to 300 THz
• D. From 300 GHz to 3 PHz

Answer: (B)

Radio waves occupy a broad slice of the electromagnetic spectrum, defined by a frequency range from about 3 kilohertz up to 300 gigahertz. This means wavelengths from roughly 100 kilometers at the low end to about 1 millimeter at the high end (since wavelength = c/f). That wide span covers longwave and medium wave communications all the way into microwaves, which is why radio technology includes everything from AM/FM signals to Wi‑Fi and radar bands. Starting at 0 Hz isn’t meaningful for a wave because zero frequency is static, not an oscillating field. A range from 3 kHz to 300 GHz captures the full set of radio bands; ranges that start higher miss the long-range radio portions, while ranges that go even higher would jump into infrared and beyond, which are not considered radio waves.

Radio waves occupy a broad slice of the electromagnetic spectrum, defined by a frequency range from about 3 kilohertz up to 300 gigahertz. This means wavelengths from roughly 100 kilometers at the low end to about 1 millimeter at the high end (since wavelength = c/f). That wide span covers longwave and medium wave communications all the way into microwaves, which is why radio technology includes everything from AM/FM signals to Wi‑Fi and radar bands.

Starting at 0 Hz isn’t meaningful for a wave because zero frequency is static, not an oscillating field. A range from 3 kHz to 300 GHz captures the full set of radio bands; ranges that start higher miss the long-range radio portions, while ranges that go even higher would jump into infrared and beyond, which are not considered radio waves.