Physics
X-rays region lies between

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

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Physics
Light houses are places with powerful lights to :

Guide and warn the ships coming from different directions in the ocean
Guide and help large crowds at religious gathering during nights
Guide and resolve traffic jams in crowded metro-cities during nights
Indicate to the incoming warships, the location of a harbour during night

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