Why is a semiconductor a semi conductor? a)Only a small fraction of valence elec

Question

Why is a semiconductor a semiconductor?
a)Only a small fraction of valence electrons are excited into a conduction band.
b)Almost all states in the conduction band are filled, preventing conduction through the Pauli exclusion principle.
c)Only a small fraction of valence electrons fall into available holes.
d)Almost all states in the conduction band are filled, preventing further occupancy.
Why are diamonds transparent?
a)The band gap is too wide, so visible photons cannot excite electrons.
b)The band gap is narrow enough so visible photons can excite electrons.
c)The band gap is wide enough so visible photons can excite electrons.
d)The band gap is too narrow, so visible photons cannot excite electrons.

Explanation / Answer

Why is a semiconductor a semiconductor?

Almost all states in the conduction band are filled, preventing conduction through the Pauli exclusion principle.

Why are diamonds transparent?

a)The band gap is too wide, so visible photons cannot excite electrons.

the pyramids found in diamonds cannot absorb any visible
light and as a result are transparent. The reason for the difference is that
the electrons in the large flat sheets of graphite can all "giggle" at many
frequencies, but the tightly bound and constrained electrons in diamond are
not free to "giggle" and thus cannot absorb light.

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