Fire alarms - why high-pitched noise?

[Cervaise]

@jtgain

People have become so accustomed to the false alarms that they will sit through a real one until it’s too late, all the while bitching about the noise…

Hence the arms race to make them less and less tolerable.

Mark my words, in twenty years, fire alarms will have to shoot out actual jets of fire before people will leave when they start.