Q9 of 30 Page 86

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colors, the red light

Red color of danger signal installed at the top of tall building can be easily seen from a distance than other colors because red colour, having longest wavelength, is scattered least by smog or fog than other colors and that’s why it is visible from a distance.

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