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Robin3BD

03-25-2017 01:32 AM

Why the red light is used as a danger signal?

Why red? Why not another color light?:D

Victor Wilson

03-26-2017 07:50 AM

Because it's the color of blood. i think so

Ayan Das

03-26-2017 08:52 AM

Red color has got the longest wavelength because of that it is visible from long distance.

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