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

A microwave motion detector detects an intruder by which principle?

Doppler shift of a transmitted microwave field reflected from a moving object A change in infrared energy only Breakage of a conductive foil strip Opening of a reed switch

Correct Answer:

Doppler shift of a transmitted microwave field reflected from a moving object

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