Question

assertion: danger signals are made of red colour. Reason: velocity of red light in air is maximum, so signals are visible even in dark room ​

Answer 1

The danger signals prefer to be of red color due to the following reasons;

Explanation:

• The danger signals consists of red color because the red color light scatter least amount of air molecules.
• The effect of scattering is inversely related to the wavelength of light.
• The red color has the largest wavelength from all the colors in the VIBGYOR then it scatter least amount of light.
• Thus red light is preferred to pass signals without any hindrance and the light pass to the fog and rain without any delay.

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Answer 2

Answer:

Red colour is always used for danger signals, because as red colour is having the longest wavelength, it is the least scattered. So, this signal can be seen from a very long distance.