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Automatic doors use a motion sensor, or optical sensor. The sensors are usually based at the top of the door, slightly in front of it, so that it can detect when someone becomes near to the door and trigger it to open as a result. They are ideal for busy shops or industrial buildings, where having regular doors may cause congestion or be a safety hazard.

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โˆ™ 2011-03-16 11:44:40
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Physics

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A wave has a frequency of 250 hertz what is the period of the wave

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Physics

20 cards

A wave has a frequency of 250 hertz what is the period of the wave

In which material does sound travel the fastest

In this type of wave particles of the medium vibrate perpendicularly to the direction of the wave itself

A 5 ohm resistor a 10 ohm resistor and a 15 ohm resistor are connected in series to a 120 volt power source What is the amount of current flowing between the 5 ohm resistor and the 10 ohm resistor

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Q: What is the technology behind an automatic door?
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