Question:
How many times, the electromagnetic energy passes through the atmosphere from the Sun to the Earth and back to the sensor?
How many times, the electromagnetic energy passes through the atmosphere from the Sun to the Earth and back to the sensor?
Show Hint
In passive remote sensing the Sun is the energy source.
Updated On: Jun 16, 2026
- Three
- Two
- One
- Four
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The Correct Option is B
Solution and Explanation
Concept:
In passive remote sensing the Sun is the energy source. The radiation has to travel through the atmosphere to reach the Earth's surface, and then the reflected radiation must travel back through the atmosphere to reach the sensor on the satellite or aircraft.
Step 1:
First pass: solar energy comes down from the Sun and passes through the atmosphere on its way to the Earth's surface.
Step 2:
Second pass: after striking the surface, the reflected energy travels upward and passes through the atmosphere again before reaching the sensor. So the energy passes through the atmosphere two times.
Answer: Option (2) — Two.
In passive remote sensing the Sun is the energy source. The radiation has to travel through the atmosphere to reach the Earth's surface, and then the reflected radiation must travel back through the atmosphere to reach the sensor on the satellite or aircraft.
Step 1:
First pass: solar energy comes down from the Sun and passes through the atmosphere on its way to the Earth's surface.
Step 2:
Second pass: after striking the surface, the reflected energy travels upward and passes through the atmosphere again before reaching the sensor. So the energy passes through the atmosphere two times.
Answer: Option (2) — Two.
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