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Why Red colour is used in danger signal?...

Why Red colour is used in danger signal?

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(i) In a visible light range, the wavelength of red light is maximum, i.e. 700 nm.
(ii) The maximum scattering of light is for blue light and the least scattering of red light takes place.
(iii) Thus, red light can travel to longer distance and can be visible from far off distance.
(iv) Therefore, the danger signals are red coloured.
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