Which statement is true about radio wave propagation?

Which statement is true about radio wave propagation?

• A. It is unaffected by weather
• B. It is influenced by weather, location, and time of day
• C. It only depends on transmitter power
• D. It only depends on frequency

Answer: (B)

Radio wave propagation depends on the conditions along the path, including weather, location, and time of day. Weather changes the atmosphere’s refractive properties and can cause attenuation, scattering, or rain fade, especially at higher frequencies. The terrain and objects in the path—mountains, buildings, water surfaces—affect propagation by reflecting, diffracting, or absorbing the signal, so the same transmitter can behave very differently in different locations. Time of day shifts ionospheric conditions because solar radiation alters the ionosphere’s density, changing how skywave signals travel; daytime increased absorption can limit some long-range paths, while nighttime conditions can enable different propagation to occur. Because of these factors, propagation isn’t determined solely by power or frequency; weather, location, and time of day all influence how far and how well a radio wave travels.

Radio wave propagation depends on the conditions along the path, including weather, location, and time of day. Weather changes the atmosphere’s refractive properties and can cause attenuation, scattering, or rain fade, especially at higher frequencies. The terrain and objects in the path—mountains, buildings, water surfaces—affect propagation by reflecting, diffracting, or absorbing the signal, so the same transmitter can behave very differently in different locations. Time of day shifts ionospheric conditions because solar radiation alters the ionosphere’s density, changing how skywave signals travel; daytime increased absorption can limit some long-range paths, while nighttime conditions can enable different propagation to occur. Because of these factors, propagation isn’t determined solely by power or frequency; weather, location, and time of day all influence how far and how well a radio wave travels.