Radar is an "active" remote sensing system and ________ is a "passive" system using the same wavelengths.
A) the use of a thermometer
B) ultraviolet sensing
C) microwave sensing
D) photography
E) thermal infrared sensing

Question

Quizplus · Accepted Answer

Microwave sensing can be passive, as it involves detecting naturally emitted microwave radiation from objects, unlike radar which actively emits signals.

Radar Is an "Active" Remote Sensing System and ________ Is