Physics
Solar cells work on the principle of

Photosynthesis
Photovoltaic effect
Photoelectric effect
Photoconductive effect

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

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

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