Question

Which one of the following is not a common type of remote sensing sensor?

• A. Hyperspectral
• B. LiDAR
• C. Radar
• D. Microphone

Hint:

Remote sensing sensors detect electromagnetic energy reflected or emitted from a target, either passively (recording natural energy) or actively (sending out their own energy and recording the return).

Answer 1

The Correct Option is D

Step 1: Recall what a sensor does.
A remote sensing sensor detects electromagnetic energy that a target reflects or gives off, either passively or actively.

Step 2: Check hyperspectral.
A hyperspectral sensor records energy in many narrow bands, so it is a genuine remote sensing sensor.

Step 3: Check LiDAR.
LiDAR sends out laser pulses and times the return, so it is an active remote sensing sensor.

Step 4: Check radar.
Radar sends out microwave pulses and records the echo, so it too is a real remote sensing sensor.

Step 5: Look at the microphone.
A microphone picks up sound waves, not electromagnetic energy, so it has nothing to do with remote sensing.

Step 6: State the answer.
The one that is not a remote sensing sensor is the microphone.
\[ \boxed{\text{Microphone}} \]