Question

Sensors that provide their own energy source for illumination are known as:

• A. Passive
• B. Active
• C. Imaging
• D. Non-imaging

Hint:

Remember: \[ \boxed{ \begin{aligned} \text{Active Sensor} &\rightarrow \text{Emits its own energy} \text{Passive Sensor} &\rightarrow \text{Uses natural energy} \end{aligned} } \]

Answer 1

The Correct Option is B

Concept: Remote sensing sensors are classified into active and passive sensors based on the source of electromagnetic energy.

Step 1: Understand active sensors. Active sensors emit their own electromagnetic energy towards the target and measure the reflected signal. Examples include:
• RADAR
• LiDAR

Step 2: Differentiate from passive sensors. Passive sensors depend on natural energy sources such as sunlight or thermal radiation emitted by objects. Hence, \[ \boxed{\text{Sensors providing their own energy source are Active Sensors}.} \] Therefore, the correct option is \[ \boxed{(B)\;\text{Active}.} \]