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

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Solution

(d) blue colour is most scattered

this also can answer

(a) red colour is least scattered
but more prefered is option d

During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red is mostly scattered away. Most of the red light, which is the least scattered, enters our eyes. Hence, the sun and the sky appear red.

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Question 9
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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 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