Question 7A5

Super High Frequency (SHF) is defined as the range from 3 GHz to 30 GHz. This classification is part of the International Telecommunication Union (ITU) radio band designations, which categorize frequencies based on their characteristics and typical applications. * **B) 3-30 GHz:** This is the correct range for Super High Frequency (SHF). Frequencies in this band are commonly used for microwave links, satellite communications, radar, and Wi-Fi (e.g., 5 GHz). Their shorter wavelengths allow for smaller antennas and higher data rates, but they are more susceptible to atmospheric attenuation. Let's look at why the other options are incorrect: * **A) 30-300 GHz:** This range defines Extremely High Frequency (EHF), sometimes referred to as millimeter wave. * **C) 300-3,000 MHz (0.3-3 GHz):** This range is Ultra High Frequency (UHF), used for television broadcasting, cell phones, and many amateur radio bands. * **D) 30-300 MHz:** This range is Very High Frequency (VHF), commonly used for FM radio, TV broadcasting, and aviation communications.