Which option is NOT a factor influencing the effective wireless range?

• A. Screen resolution
• B. Power of the antenna
• C. Physical barriers
• D. Interference in the environment

Answer: (A)

Range depends on how radio waves propagate and what can affect them in the environment. The power of the antenna increases the energy that reaches the receiver, so higher transmit power (and antenna gain) usually extends the distance over which the signal can be decoded. Physical barriers like walls, metal, and furniture attenuate and scatter signals, so more obstacles shorten the usable range. Interference in the environment, from other devices or overlapping channels, lowers the signal-to-noise ratio, making it harder to distinguish the signal and effectively reducing range. Screen resolution, on the other hand, is a display property and does not influence radio propagation, so it does not affect wireless range.