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Advanced Sunrise and Delayed Sunset

The day is lo...

Question

The day is longer on the earth by about 4 minutes because :
(a) the earth is round in shape (b) the earth rotates on its axis
(c) the earth revolves around the sun (d) the earth has atmosphere

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Solution

Answer : (d) the earth has atmosphere

Explanation : In the absence of atmosphere there won't be atmospheric refraction and hence no advanced sunrise and no delayed sun set. So length of day will shorter by 2+2=4minutes.

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