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प्रश्न
The danger signal is red. Why?
उत्तर
Since the wavelength of red light is the longest in the visible light, the light of red colour is scattered the least by the air molecules of the atmosphere and therefore the light of red colour can penetrate to a longer distance. Thus red light can be seen from the farthest distance as compared to other colours of same intensity. Hence it is used for danger signal so that the signal may be visible from the far distance.
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संबंधित प्रश्न
Name a natural phenomenon which is caused by the dispersion of sunlight in the sky.
Name the scientist who discovered that sunlight consists of seven colours.
Which colour of the spectrum has
longest wavelength,
The blue colour of sky is due to:
(a) refraction of light
(b) dispersion of light
(c) diffraction of light
(d) scattering of light
The red colour of the sun at the time of sunrise and sunset is because:
(a) red colour is least scattered
(b) blue colour is least scattered
(c) red colour is most scattered
(d) blue colour is most scattered
Complete the following statement:
When the sun is setting, the light from it has to travel a ................ thickness of the earth's atmosphere and only ................ wavelength ................ light is able to reach us. Sunset is therefore ................
Which colour of white light is scattered the least? Give reason.
Which of the following statements is correct regarding the propagation of light of different colours of white light in the air?
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.
