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प्रश्न
Why are the ‘danger signal’ lights red in colour?
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उत्तर
Danger signal lights are red because this colour has the longest wavelength among all the colours. Also, it is the least scattered by fog, dust and smoke particles. This makes red light visible even from a longer distance.
संबंधित प्रश्न
Why does sun appear red at sunrise and sunset?
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a few minutes before actual sunrise?
Why does the sky appear dark (or black) to an astronaut instead of blue?
Why does the sun appear red at sunset?
Using the phenomenon of scattering of light, explain why there is a difference in the colour of the sun as it appears during sunrise and at noon.
Why is the Tyndall effect shown by colloidal particles?
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 ____________.
Which of the following statements is correct regarding the propagation of light of different colours of white light in the air?
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