Which of the following is an example of an active remote sensing device?
A)film
B)infrared sensor
C)video camera
D)radar
E)echometer

Question

Quizplus · Accepted Answer

Radar is an example of an active remote sensing device as it emits energy (usually radio waves) and detects the reflection or backscatter of this energy from the target. In contrast, film, infrared sensors, and video cameras passively detect the energy emitted or reflected by the target. Echometer is not used for remote sensing; it is a tool for measuring liquid levels in oil wells.

Which of the Following Is an Example of an Active