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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
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.
With the help of a labelled diagram, explain why the sun appears reddish at the sun-rise and the sun-set.
Explain giving reason why the sky appears blue to an observer from the surface of the earth? What will the colour of the sky be for an astronaut staying in the international space station orbiting the earth? Justify your answer giving reason.
What is meant by dispersion of white light? Describe the formation of rainbow in the sky with the help of a diagram.
Explain why, the sun can be seen about two minutes before actual sunrise. Draw a diagram to Illustrate your answer.
State whether the following statements are true or false:
The scattering away of blue light makes the sun appear red at sunset.
Why does the sky appear dark (or black) to an astronaut instead of blue?
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
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
How would the sky appear when seen from the space (or moon)? Give reason for your answer.
Using the phenomenon of scattering of light, explain why there is a difference in the colour of the sun as it appears during sunrise and at noon.
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.
Answer the following question:
Why is the Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.
In the atmosphere which colour of light gets scattered the least?
At noon the sun appears white as:
Twinkling of stars is due to atmospheric
How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon?
