Question

In insulators, the valence bands are completely and the large band gap prevents the promotion of electrons to empty space whereas in semiconductor band gap is low.

• A. false
• B. true
• C. band gap is high
• D. none of these

Answer 1

Answer: (B)

true

In insulators, the valence bands are completely filled and the large band gap prevents the promotion of electrons to empty space. Hence, insulators do not conduct electricity. Whereas in semiconductor band gap is low. Hence, the electrons can be easily promoted from valence band into empty space due to which, they can conduct electricity to a little extent.