What is the voltage standing wave ratio (VSWR used to measure? a. The loss of energy due to attenuation b. Signal amplification C. The power of reflected waves d. Impedance mismatch in RF systems

The correct answer is d. Impedance mismatch in RF systems.<br /><br />Voltage Standing Wave Ratio (VSWR) is a measure of the impedance mismatch between a transmission line and its load. It is used to quantify the amount of reflected power in an RF (radio frequency) system. When there is an impedance mismatch, some of the power is reflected back, resulting in standing waves on the transmission line. VSWR is a useful metric to assess the severity of this mismatch and to ensure that the system operates efficiently and reliably.