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Standard XII
Physics
Mechanism of Carrier Conduction
Question

A hole is
  1. a positively charged electron.
  2. an electron in the valence band.
  3. an unfilled covalent bond.
  4. an excess electron in covalent bond.

A
an excess electron in covalent bond.
B
an electron in the valence band.
C
a positively charged electron.
D
an unfilled covalent bond.
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Solution
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When the covalent bond breaks, electrons are freed from atom. The departure of electron from valence band creates vacancy in bond, this vacancy is known as hole. Hence, a hole is an unfilled covalent bond.

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