Which statement about RF communications is accurate?

Which statement about RF communications is accurate?

• A. It uses transmission of information via electromagnetic waves.
• B. It relies on fiber optic cables for data transfer.
• C. It uses sound waves to transmit data underwater.
• D. It requires no medium for signal propagation.

Answer: (B)

The key idea is that RF communications move information by modulating and radiating radio frequency electromagnetic waves. Antennas transmit and receive these waves, which propagate through space or along guided paths, carrying the signal without needing a physical electrical cable. That makes the statement about using electromagnetic waves accurate. Fiber optic cables carry data with light in glass, not radio waves, so that description doesn’t fit RF. Underwater data transmission that relies on sound is an acoustic method, not RF. The notion that no medium is required is misleading for practical RF systems—electromagnetic waves can travel through vacuum, but real-world RF communication typically operates through air or space, so saying “no medium is required” isn’t correct in the usual context.

The key idea is that RF communications move information by modulating and radiating radio frequency electromagnetic waves. Antennas transmit and receive these waves, which propagate through space or along guided paths, carrying the signal without needing a physical electrical cable.

That makes the statement about using electromagnetic waves accurate. Fiber optic cables carry data with light in glass, not radio waves, so that description doesn’t fit RF. Underwater data transmission that relies on sound is an acoustic method, not RF. The notion that no medium is required is misleading for practical RF systems—electromagnetic waves can travel through vacuum, but real-world RF communication typically operates through air or space, so saying “no medium is required” isn’t correct in the usual context.