SC Burglar Alarm Practice Questions - South Carolina Burglar Alarm Contractor Examination Exam

A passive infrared (PIR) motion detector responds primarily to which stimulus?

A change in received infrared energy as a warm object moves across its fields of view The Doppler shift of a microwave field it transmits The sound of breaking glass near 5 kHz A change in capacitance of a protected metal object

Correct Answer:

A change in received infrared energy as a warm object moves across its fields of view

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