Which device allows for communication over long distances at higher power levels?

• A. Transmitter
• B. Antenna
• C. RF power amplifier
• D. Receiver

Answer: (C)

The correct answer is RF power amplifier, as it plays a crucial role in enhancing the transmission capability of signals for long-distance communication. When a transmitted signal travels over a distance, it may suffer from attenuation and loss of strength. A radio frequency (RF) power amplifier strengthens the signal's power before it is transmitted, allowing it to cover larger distances and improve the overall range and clarity of the communication.

While the transmitter is responsible for generating the radio frequency signal, it may not always provide enough power to reach distant stations effectively. The antenna also contributes to communication range but is primarily responsible for converting electrical signals into radio waves and vice versa; its efficiency depends partly on the power supplied to it. The receiver's role is to capture incoming signals, but it does not amplify the transmission itself. In contrast, the RF power amplifier specifically focuses on boosting the signal strength to ensure robust communication over long distances.