Physics
X-rays region lies between

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

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Physics
The blue colour of sky is due to

Scattering of shorter wavelengths of sunlight in the atmosphere
Refraction of sunlight
Reflection of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere

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