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Quest
Red Ball in the sky
When the sun rises in the morning, it appears like a red ball. As the day advances, the colour appears white, but at sunset, the colour again appears red. Why is this?
We know that the earth revolved round the sun. The part of the earth receiving the sunlight is lighted and we say it is day in that part. We know that the white sunlight comprises of seven colours — violet, indigo, blue, green, yellow, orange and red. In the morning and evening, when the sun is near the horizon, the rays have to travel a longer path in the atmosphere to reach us than in the noon. The distance travelled by the sunrays in the atmosphere in morning and evening is fifty times more than that in the noon. The dust, smoke and water vapours present in the atmosphere scatter these colours differently. Violet is scattered most and red is scattered least. Therefore, the amount of red light, which reaches our eyes, is maximum. As a result the sun appears red while rising and setting.
Deepthi Nagesh B, IX
Bangalore: Nivedita Girls' High School
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