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प्रश्न
Why does sun appear red at sunrise and sunset?
Why does the Sun appear red at sunrise?
उत्तर १
At the time of sunset or sunrise, the Sun and its surroundings appear red because of the scattering of light. At the time of sunset or sunrise, the light rays from the Sun have to travel a long distance to reach our eyes through the Earth's atmosphere. In other words, we can say that when we look towards the horizon, we are looking through more of Earth’s atmosphere than when we look overhead. The light reaching our eyes is rich in red color as blue light is largely scattered away by the particles present in the Earth's atmosphere.
उत्तर २
At sunrise, 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 is of shorter wavelength, gets scattered from our line of sight. Thus, the red colour present in sunlight, which has a longer wavelength and is scattered the least, reaches our eye. As we see red light everywhere above, the sun and the surrounding sky appear red at sunrise.
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संबंधित प्रश्न
Which color of white light is scattered the least and why?
What colours make up white light?
Give the meaning of the term VIBGYOR. With which phenomenon is it connected?
What is meant by dispersion of white light? Describe the formation of rainbow in the sky with the help of a diagram.
Which phenomenon makes us see the sun:
a few minutes after actual sunset?
Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.
State whether the following statements are true or false:
The scattering away of blue light makes the sun appear red at sunset.
What is tyndall effect? Explain with an example.
What happens when a beam of sunlight enters a dusty room through a window? Explain your answer.
Why does the sky appear dark (or black) to an astronaut instead of blue?
The blue colour of sky is due to:
(a) refraction of light
(b) dispersion of light
(c) diffraction of light
(d) scattering of light
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 ................
What characteristic property of light is responsible for the blue colour of the sky?
Explain in brief the reason for the following :
Delayed sunset
A beam of blue, green and yellow light passes through the earth's atmosphere. Name the colour which is scattered the most.
Draw a labeled diagram to show
(i) the reddish appearance of the sun at the sunrise or the sunset and
(ii) white appearance of the sun at noon when it is overhead.
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.
What is the difference in colours of the Sun observed during sunrise/sunset and noon? Give explanation for each.
The colour of clear sky from the earth appears blue but from the space it appears black. Why?
