Physics
X-rays region lies between

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

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media
No radiation of heat takes place
Two thin shirts become thicker so prevent transmission of heat

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