Why is red light used as a universal danger signal?
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Answer: Red light is use as a danger signal.
Explanation: it is because it has long wave length,therefore the red light is scattered the least by the air molecules of atmosphere.Hence the light of red color compared to other colours can penetrate to a longer distance without becoming weak. Thus it can be seen from even farthest distance.
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Explanation:If an electric fan is switched on in a closed room, the air will be heated because due to motion of the fan, the speed of air molecules will increase. In fact, we feel cold due to evaporation of our sweat.
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