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Materials and Components - Engineering

Q1:

As the temperature of a pure silicon specimen is increased

A the number of free electrons increases

B the number of holes decreases

C the number of holes increases

D the number of free electrons and holes increases

ANS:D - the number of free electrons and holes increases

As the temperature inc, the bond between the valence electrons and the nucleus breaks and a electron is released. These free electron will give rise to a free hole and the current flows due to these free electrons.