Physics
In radio-communication, the signals emitted by transmitting antenna are reflected on

Ozonosphere
Stratosphere
Troposphere
Ionosphere

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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
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They make the electric equipments more reliable and easier for servicing
If a part of the integrated circuit fails the entire circuit is simply replaced

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