उत्तर : 1. "TRUE"
व्याख्या :

Answer: A) TRUE Explanation: Microwaves are high-frequency signals in the 300 MHz to 300 GHz range. This is in contrast to radio signals, which are typically broadcast in all directions. Radio signals operate in the 3 Hz to 300 MHz range. Microwave signals are used for both satellite and ground-based communications.