Electromagnetic waves used for wireless communication.

Electromagnetic waves used for wireless communication.

• A. Wi-Fi
• B. RF
• C. Infrared
• D. Bluetooth

Answer: (B)

Wireless communication relies on radio frequency waves, a portion of the electromagnetic spectrum dedicated to sending data through the air. These waves can travel through walls, be modulated to carry information, and support a wide range of technologies. Technologies like Wi‑Fi and Bluetooth are examples of systems that use these radio waves within specific frequency bands (for example, Wi‑Fi commonly operates around 2.4 GHz and 5 GHz, Bluetooth around 2.4 GHz). Infrared, while also electromagnetic energy used for wireless links, works with infrared light and typically requires line-of-sight with shorter range. Since the question asks for the general category of waves used for wireless communication, radio frequency (RF) is the broad, appropriate term.

Wireless communication relies on radio frequency waves, a portion of the electromagnetic spectrum dedicated to sending data through the air. These waves can travel through walls, be modulated to carry information, and support a wide range of technologies. Technologies like Wi‑Fi and Bluetooth are examples of systems that use these radio waves within specific frequency bands (for example, Wi‑Fi commonly operates around 2.4 GHz and 5 GHz, Bluetooth around 2.4 GHz). Infrared, while also electromagnetic energy used for wireless links, works with infrared light and typically requires line-of-sight with shorter range. Since the question asks for the general category of waves used for wireless communication, radio frequency (RF) is the broad, appropriate term.