On the basis of the classical free electron theory, electrical conduction Can occur in solid available. On the other hand, according a if free electrons are o band theory electrical conduction can take place in solid only if(i) a good number of free electrons are present and (ii) vacant levels are available immediately above the occupied energy levels Free electrons can absorb energy from the current source only inhere are unoccupied energy levels nearby gaining energy they jump into the empty levels giving rise to an electric current It describes that a partially filled band is required for causing electrica conduction.
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