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प्रश्न
Why does the sun appear red at sunset?
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उत्तर
At sunset, the sun is near the horizon; hence, sunlight has to travel a longer distance through the atmosphere to reach us. During this journey, most of the blue colour present in sunlight, which has a shorter wavelength, gets scattered from our line of sight. Thus, the red colour present in sunlight, which has a longer wavelength and gets scattered the least, reaches our eye. As we see red colour everywhere overhead, the sun and the surrounding sky appear red at sunset.
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संबंधित प्रश्न
Why does the sun appear reddish early in the morning? Will this phenomenon be observed by an observer on the moon? Justify your answer with a reason.
Which color of white light is scattered the least and why?
What information do we get about sunlight from the formation of a rainbow?
Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.
The sky appears blue because some of the blue component of sunlight is scattered by:
(a) gas molecules present in air
(b) dust particles present in air
(c) water droplets suspended in air
(d) soot particles present in air
In an experiment to study the scattering of light by passing a beam of white light through a colloidal solution of sulphur in a transparent glass tank:
Which colour is observed from the sides of the glass tank? Does this colour correspond to the colour of sky on a clear day or the colour of sky around the sun at sunset?
Name the point on the lens through which a ray of light passes undeviated.
A beam of blue, green, and yellow light passes through the earth's atmosphere. Name the colour which is scattered the least.
Is the position of a star as seen by us its true position? Justify your answer.
What is the difference in colours of the Sun observed during sunrise/sunset and noon? Give explanation for each.
