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Question
Which of the following represents correct order of conductivity in solids?
Options
\[\ce{Κ_{metal} >> K_{insulators} < K_{semiconductors}}\]
\[\ce{Κ_{metal} << K_{insulators} < K_{semiconductors}}\]
\[\ce{Κ_{metal} ≅ K_{insulators} > K_{semiconductors} = zero}\]
\[\ce{Κ_{metal} < K_{insulators} > K_{semiconductors} ≠ zero}\]
Solution
\[\ce{Κ_{metal} >> K_{insulators} < K_{semiconductors}}\]
Explanation:
Conductivity of metal, insulator and semiconductors can be represented in the term of k (Kappa) which depends upon energy gap between valence band and conduction band.
Valence and conductance bands in metals, semiconductors and insulators.
| Valued K(Ω–1 m–1) | |
| Metal | 104 to 107 |
| Insulator | 10–20 to 10–10 |
| Semiconductor | 10–6 to 104 |
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