Which statement about radio waves is true?

Which statement about radio waves is true?

• A. They are a type of electromagnetic radiation used primarily for communication.
• B. They require a medium to propagate.
• C. They travel faster than light.
• D. They cannot be modulated.

Answer: (A)

Radio waves are a form of electromagnetic radiation that can carry information by modulating a property of the wave, such as its amplitude, frequency, or phase. This modulation is what makes radio waves so useful for communication—they transmit encoded data across distances through space (and through air or other media). The statement is true because radio waves are EM radiation and are primarily used to convey information via modulation. They do not require a material medium to propagate, they travel at the speed of light, and they can be modulated to carry signals; the claims that they need a medium, travel faster than light, or cannot be modulated are not accurate.

Radio waves are a form of electromagnetic radiation that can carry information by modulating a property of the wave, such as its amplitude, frequency, or phase. This modulation is what makes radio waves so useful for communication—they transmit encoded data across distances through space (and through air or other media). The statement is true because radio waves are EM radiation and are primarily used to convey information via modulation. They do not require a material medium to propagate, they travel at the speed of light, and they can be modulated to carry signals; the claims that they need a medium, travel faster than light, or cannot be modulated are not accurate.