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प्रश्न
The clouds are seen white. Explain
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उत्तर
The clouds are nearer the earth surface and they contain dust particles and aggregates of water molecules of sizes bigger than the wavelength of visible light. Therefore, the dust particles and water molecules present in clouds scatter all colours of incident white light from sun to the same extent and hence when the scattered light reaches our eye, the clouds are seen white.
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संबंधित प्रश्न
What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the Sun appears reddish at sunrise.
Why does sun appear red at sunrise and sunset?
Name the phenomenon due to which the stars seem higher in the sky than they actually are.
Which of the two is scattered more easily, light of shorter wavelengths or light of longer wavelengths?
What is tyndall effect? Explain with an example.
Why does the sun appear red at sunset?
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
What is the colour of the clear sky during day time? Give reason for it.
Which colour of white light is scattered the least? Give reason.
Draw a labelled diagram to show
- the reddish appearance of the sun at sunrise or sunset, and
- white appearance of the sun at noon when it is overhead.
