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प्रश्न
Why does sun appear red at sunrise and sunset?
Why does the Sun appear red at sunrise?
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उत्तर
- At sunrise or sunset, the Sun and its surroundings appear red due to light scattering.
- 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 colour, as blue light is largely scattered by the particles in Earth’s atmosphere.
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संबंधित प्रश्न
What did Newton demonstrate by his experiments with the prism?
Which phenomenon makes us see the sun:
a few minutes after actual sunset?
What is tyndall effect? Explain with an example.
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 ................
When sunlight enters the earth’s atmosphere, state which colour of light is scattered
- the most and
- which the least.
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.
Describe an experiment to show that “sunlight is essential for photosynthesis”.
Is the position of a star as seen by us its true position? Justify your answer.
How can we explain the reddish appearance of sun at sunrise or sunset? Why does it not appear red at noon?
