Physics
An integrated circuit is more advantages than a coventional circuit because

A faulty part of a conventional circuit may be difficult to locate and repair
All listed here
If a part of the integrated circuit fails the entire circuit is simply replaced
They make the electric equipments more reliable and easier for servicing

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Physics
RADAR is used for:

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

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