Physics
Steel is more elastic than rubber because it :

Requires larger deforming force
Is deformed very easily
Is harder than rubber
Is never deformed

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Physics
Energy in reflected light :

Becomes maximum for angle of incidence equal to 45°
Decreases with the increase in angle of incidence
Increases with the increase in angle
Does not depends on the angle of incidence

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Physics
RADAR is used for:

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

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