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Which outcome occurs when arsenic is added to silicon?

A)Increased electron carrier concentration results
B)Reduced phonon mean free path yields
C)Higher hole carrier mobility develops
D)Enhanced intrinsic carrier concentration evolves

💡 Explanation

Adding arsenic introduces a donor impurity level near the conduction band, therefore increasing free electrons. Because arsenic has an extra valence electron, this allows for n-type doping, rather than increasing hole concentration or affecting phonon behavior.

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