True or False: A passive sensor emits its own energy to measure reflected or scattered energy.

The statement is false because passive sensors do not emit their own energy but instead detect and measure energy that is reflected or scattered from an external source, such as the sun. They rely on natural energy, typically from sunlight, to illuminate the target area they are observing. This is different from active sensors, which generate their own energy (like radar or LiDAR) to illuminate the target for measurement. The distinction is crucial in remote sensing and various applications of unmanned aircraft systems (UAS), where understanding the type of sensor and its operation directly impacts data collection and analysis.