1.

At sunrise or at sunset the sun appears to be reddish while at mid-day it looks white. This is because

A.  scattering due to dust particles and air molecules causes this phenomenon  
B.  the sun is cooler at sunrise or at sunset
C.  refraction causes this phenomenon
D.  diffraction sends red rays to the earth at these times
Answer» B.  the sun is cooler at sunrise or at sunset


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