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Semiconductor physics is the branch of solid state physics that focuses on specific properties of semiconductors. It studies dynamics of different perturbations (mainly electrons and holes) in the semiconductor crystal and the ways to harness it in electrical circuits.
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Explanation for transistor as amplifier
You have got the 'amplification' idea wrong.You may add thousands and thousands of electrons to the input signal. But if 'CHANGES' are of same value as input signal , you do not have amplification. Yo …