Physics
Sun appears red in colour at sunrise and sunset due to

That sun comes out of the mountains
The fact that sun emits only red colour at that time
That all other colours scatter away except red
Red light having longer wave length scatters away

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Physics
X-rays region lies between

Gamma-rays and ultraviolet region
Short radio waves and long radio waves
Ultraviolet and visible region
Visible and infra-red region

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