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What kind of waves does the IR Sensor work on?

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What kind of waves does the IR Sensor work on?

(a) Infrared

(b) Indigo

(c) Ultrasonic

(d) Infrasonic

I had been asked this question in a national level competition.

My question comes from IR Sensor topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

1 Answer

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Right choice is (a) Infrared

To explain: The IR Sensor works on Infrared waves. These waves have a longer wavelength than visible light and are a form of electromagnetic radiation. Usually Infrared can be felt as heat when incident on humans, but the sensor’s intensity is too small to be felt usually.

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