Q139 / 200 · NEET 2011 (Screening) · Physics

If a small amount of antimony is added to germanium crystal

A
the antimony becomes an acceptor atom
Correct answer
B
there will be more free electrons than holes in the semiconductor
C
its resistance is increased
D
it becomes a $p$-type semiconductor

Solution

When a small amount of antimony is added to germanium crystal, the crystal becomes $n$-type semiconductor because antimoney is a pentavalent substrate. It excess free electrons.

Hence, the correct answer is option: 'B'.

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