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26 September, 04:01

What type of electromagnetic wave is used in security alarms

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  1. 26 September, 06:46
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    infrared radiations are used in security alarms. in these kind of security alarms, when a beam of infrared radiation is blocked by an intruder, it triggers the security alarms for a fixed amount of time. it is used because it is invisible and can not be detected by an intruder. warm objects emits infrared radiation. this fact is used to detect in dark.
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