Question

A passive sensor uses:

• A. Sun as source of energy
• B. Flashlight as a source of energy
• C. Its own source of energy
• D. Doesn't need any source of energy

Hint:

Remember: \[ \boxed{ \begin{aligned} \text{Passive Sensor} &\rightarrow \text{Sun's energy} \text{Active Sensor} &\rightarrow \text{Own energy source} \end{aligned} } \]

Answer 1

The Correct Option is A

Concept: Passive sensors detect naturally available electromagnetic radiation reflected or emitted by objects. The Sun is the primary energy source for most passive remote sensing systems.

Step 1: Differentiate passive and active sensors.
• Passive sensors rely on natural radiation (mainly sunlight).
• Active sensors generate and emit their own energy.

Step 2: Choose the correct option. Thus, \[ \boxed{\text{Passive sensors use the Sun as the source of energy}.} \] Therefore, the correct option is \[ \boxed{(A).} \]