Match List-I with List-II
| List-I | List-II |
| Materials | Band gap (ev) |
| (A) Germanium | (I) 1.42 eV |
| (B) Gallium Arsenide | (II) > 3eV |
| (C) Insulator | (III) 1.1 eV |
| (D) Silicon | (IV) 0.7 eV |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A) - (IV), (B) - (I), (C) - (II), (D) - (III)
The energy band gap separates the valence band from the conduction band. It is small for semiconductors and large for insulators.
(A) Germanium — this matches (IV) 0.7 eV. Germanium has the smallest gap of the semiconductors listed (about 0.67 eV).
(B) Gallium Arsenide — this matches (I) 1.42 eV. GaAs is a compound semiconductor with a gap of about 1.42 eV.
(C) Insulator — this matches (II) > 3eV. In an insulator the gap is large, greater than about 3 eV, so electrons cannot reach the conduction band at room temperature.
(D) Silicon — this matches (III) 1.1 eV. The gap of silicon is about 1.1 eV.