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 colours, the red light:

is scattered the most by smoke or fog.

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is scattered the least by smoke or fog.

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is absorbed the most by smoke or fog.

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Reflection of light from the earth.

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Solution

The correct option is B is scattered the least by smoke or fog.
The red light has relatively longer wavelength than the other colours of the spectrum. Hence, it suffers the least scattering.

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Q. 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 colours, the red light:

Question 9
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 colours, the red light:

(a) is scattered the most by smoke or fog
(b) is scattered the least by smoke or fog
(c) is absorbed the most by smoke or fog
(d) moves fastest in air

The danger signals are red in colour because it is

Q. Why are the 'danger signal' lights red in colour?

Why are danger signal lights red in colour?

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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 colours, the red light:

The correct option is B is scattered the least by smoke or fog.The red light has relatively longer wavelength than the other colours of the spectrum. Hence, it suffers the least scattering.

The correct option is B is scattered the least by smoke or fog.
The red light has relatively longer wavelength than the other colours of the spectrum. Hence, it suffers the least scattering.