Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
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The bigger they come, the slower they move
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She says cheaper costs abroad to put on a festival could also be a factor, but feels the festival is moving because "he's on the form of his life" after his Grammy win and the release of his fourth studio album, Idols, last year.