Question:

Which of the following represents correct order of conductivity in solids?

Updated On: Jul 7, 2022
  • $K_{\text{metals}} >> K_{\text{insulators}} < K_{\text{semiconductor}}$
  • $K_{\text{metals}} << K_{\text{insulators}} < K_{\text{semiconductor}}$
  • $K_{\text{metals}} < K_{\text{semiconductor}} > K_{\text{insulators}} $
  • $K_{\text{metals}} < K_{\text{semiconductor}} > K_{\text{insulators}} $
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The Correct Option is A

Solution and 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. Hence, correct order is $k_{\text{metal}} > > k_{\text{insulators}} < k_{\text{semiconductors}}$
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Notes on The solid state

Concepts Used:

Solid State

Solids are substances that are featured by a definite shape, volume, and high density. In the solid-state, the composed particles are arranged in several manners. Solid-state, in simple terms, means "no moving parts." Thus solid-state electronic devices are the ones inclusive of solid components that don’t change their position. Solid is a state of matter where the composed particles are arranged close to each other. The composed particles can be either atoms, molecules, or ions. 

Solid State

Types of Solids:

Based on the nature of the order that is present in the arrangement of their constituent particles solids can be divided into two types;

  • Amorphous solids behave the same as super cool liquids due to the arrangement of constituent particles in short-range order. They are isotropic and have a broad melting point (range is about greater than 5°C).
  • Crystalline solids have a fixed shape and the constituent particles are arranged in a long-range order.