Is it true or false that PIRs transmit on a frequency of 100-200 KHz?

Passive Infrared Sensors (PIRs), which are commonly used in security systems to detect motion, do not transmit at a frequency of 100-200 KHz. Instead, PIRs operate on the principle of detecting changes in infrared radiation, specifically the heat emitted by human bodies or objects. They do not transmit data in the traditional sense like radio transmitters do.

The operational frequency for most PIR sensors, in terms of detection, is not measured in kilohertz (KHz) but rather is focused on the infrared spectrum, which typically ranges from approximately 8 to 14 micrometers (µm) in wavelength for thermal detection. This characteristic allows them to respond to the infrared radiation emitted by warm bodies moving within their field of view.

Therefore, stating that PIRs transmit on a frequency of 100-200 KHz is misleading and inaccurate, making the assertion false. This highlights the distinction between how PIRs function compared to devices that transmit data using radio frequencies.