Red light is used as danger signal because it is:

Accepted as symbol

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Pleasing to the eye

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Sensitive to the eye

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Has high wavelength

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Solution

The correct option is D Has high wavelength
Red light is used as danger signal because it is having high wavelength, less scattering ,hence can travel larger distances.

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Red light is used for danger signal as

Red color is used in danger signal because it scatters to a wider angle.

The red colour is used in danger signal because it is more attractive and common.

Red colour is used in danger signal because it is more attractive and common.

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