The sensor that is used when air turbulence is present in the room being protected and when there are no potential false alarm sources outside the room and in the field of the detector is a (n):

The sensor that is used when air turbulence is present in the room being protected and when there are no potential false alarm sources outside the room and in the field of the detector is a (n):
A . Vibration detector
B . Microwave motion detector
C . Ultrasonic motion detector
D . Acoustic detector
E . None of the above

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Answer: B