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प्रश्न
Explain why, when the sun is overhead at noon, it appears white, but when the same sun is near the horizon at sunset, it appears red.
Explain why the Sun appears white when it is overhead at noon, but the same Sun appears red when it is near the horizon at sunset.
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उत्तर
When the sun is overhead at noon, sunlight has to travel a shorter distance through the earth's atmosphere to reach us. During this short journey of sunlight through the atmosphere, only a small amount of the blue light is scattered from the white light, keeping most of the white colour intact within it.
However, at sunset or sunrise, the sun appears red because it is near the horizon, and sunlight has to travel a relatively longer distance through the earth's atmosphere to reach us. During this long journey, most of the blue colour is scattered from our line of sight. Therefore, the light reaching our eyes consists of the colour red of sunlight, which is of longer wavelength and is scattered the least.
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संबंधित प्रश्न
With the help of scattering of light, explain the reason for the difference in colours of the Sun as it appears during sunset/sunrise and noon.
Why does sun appear red at sunrise and sunset?
Why does the sun seem to rise two minutes before the actual sunrise and set two minutes after the actual sunset ? Explain with the help of labelled diagram.
What colours lie on the two sides of the 'green colour' in the spectrum of white light?
Name some everyday objects:
which absorb all the colours in sunlight
Why does the sky appear dark (or black) to an astronaut instead of blue?
The colour of sky, in direction other than of the sun, is blue. Explain.
Why does the sun appear red at sunrises and sunset?
Which colour of white light is scattered the least? Give reason.
Blue litmus is added to two test tubes A and B containing dilute HCl and NaOH. Answer respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
