Question

Passive remote sensing systems depend on

• A. Artificial energy sources
• B. Radar signals
• C. Solar radiation
• D. Laser pulses

Hint:

Remote sensing: \[ \boxed{ \begin{aligned} \text{Passive} &\rightarrow \text{Uses solar radiation} \text{Active} &\rightarrow \text{Uses its own energy (Radar/LiDAR)} \end{aligned} } \]

Answer 1

The Correct Option is C

Passive remote sensing systems record the natural electromagnetic radiation reflected or emitted by objects. Most passive sensors rely on sunlight (solar radiation) as the energy source. Hence, \[ \boxed{\text{Solar radiation}} \] is the correct answer. Therefore, \[ \boxed{(C)} \]