What is the wavelength range of radio waves?

What is the wavelength range of radio waves?

• A. From 1 mm to more than 100 km
• B. From 1 cm to 1 meter
• C. From 10 meters to 1 kilometer
• D. From 1 km to 1000 km

Answer: (A)

Radio waves cover wavelengths longer than infrared, roughly from about 1 millimeter up to well over 100 kilometers. The option stating 1 mm to more than 100 km matches that broad span, which is why it’s the best choice. The other ranges are narrower portions of the spectrum and miss either the very short end near 1 mm or the very long end beyond 100 km, so they don’t describe the full radio-wave range.

Radio waves cover wavelengths longer than infrared, roughly from about 1 millimeter up to well over 100 kilometers. The option stating 1 mm to more than 100 km matches that broad span, which is why it’s the best choice. The other ranges are narrower portions of the spectrum and miss either the very short end near 1 mm or the very long end beyond 100 km, so they don’t describe the full radio-wave range.