A passive sensor uses:
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A.
Signals emitted from transmission towers
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B.
Its own source of energy
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C.
Sun as the source of energy
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D.
Flash light as a source of energy
Correct Answer:
C. Sun as the source of energy
Explanation:
Passive sensors are remote sensing systems that detect and record naturally occurring energy, such as radiation reflected or emitted from the Earth's surface. Unlike active sensors, which provide their own source of illumination like a flash or laser, passive sensors rely on external sources. The most common source of naturally available energy for these sensors is the sun, which provides solar radiation that can be reflected in visible wavelengths or absorbed and re-emitted as thermal infrared. While some passive sensors can detect naturally emitted thermal energy at night, they generally require the sun to be illuminating the target to measure reflected energy. Therefore, the sun serves as the primary external source of energy for passive sensing.
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