Question Detail
Question
Which of the following is/are correct about insulator and semiconductor? (i) Insulators have narrow forbidden bands; (ii) Both insulators & semiconductors have narrow forbidden bands; (iii) conductors have wide forbidden bands; (iv) insulators have wide forbidden bands; (v) conductors have narrow forbidden bands
Correct Answer
Option C is the correct answer.
Detailed Explanation
Insulators have a wide (large) forbidden energy gap, while conductors effectively have little to no forbidden gap (narrow/overlapping bands), matching statements iv and v.
Hint
Recall the band-gap size order: conductors (~0) < semiconductors (moderate) < insulators (wide).