Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Good absorber and good reflector of heat
Good absorber and bad reflector of heat
Bad absorber and good reflector of heat

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Physics
RADAR is used for:

detecting and locating the position of objects such as Aeroplanes.
receiving a signals in a radio receiver.
locating geostationary satellites.
locating submerged submarines.

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