Question

Example of forbidden zone

Answer 1

Forbidden Zone is a 1980 American musical fantasy comedy film directed and produced by Richard Elfman, and co-written by Elfman and fellow Mystic Knights member Matthew Bright. Originally shot on black-and-white film, the film is based upon the stage performances of the Mystic Knights of the Oingo Boingo. and revolves around an alternate universe accessed through a door in the house of the Hercules family.

Answer 2

Gap between valence band and conduction band in case of insulator is very large.