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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
Which colour of the spectrum has
shortest wavelength?
We can see the sun before the actual sunrise by about:
(a) 5 minutes
(b) 2 minutes
(c) 2 hours
(d) 20 minutes
Which of the two is scattered more easily, light of shorter wavelengths or light of longer wavelengths?
When sunlight enters the earth’s atmosphere, state which colour of light is scattered
- the most and
- which the least.
In white light of sun, maximum scattering by the air molecular present in the earth’s atmosphere is for ______.
To an astronaut in a space-ship, the earth appears ______.
Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.
The clear sky appears blue because:
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
What is the difference in colours of the Sun observed during sunrise/sunset and noon? Give explanation for each.
