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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
Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the colour of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason.
Which color of white light is scattered the least and why?
Which colour of the spectrum has
longest wavelength,
Which colour of light has the shorter wavelength − red or violet?
Which phenomenon makes us see the sun:
a few minutes after actual sunset?
We can see the sun before the actual sunrise by about:
(a) 5 minutes
(b) 2 minutes
(c) 2 hours
(d) 20 minutes
State whether the following statements are true or false:
The scattering away of blue light makes the sun appear red at sunset.
Which effect is illustrated by the observation that when a beam of sunlight enters a dusty room, then its path becomes visible to us.
Which component of sunlight is scattered away when the sun appears red at sunrise or sunset?
Which phenomenon is responsible for making the path of light visible?
