A) \[{{\kappa }_{\text{metals}}}>>{{\kappa }_{\text{insulators}}}<{{\kappa }_{\text{semiconductors}}}\]
B) \[{{\kappa }_{\text{metals}}}<<{{\kappa }_{\text{insulators}}}<{{\kappa }_{\text{semiconductors}}}\]
C) \[{{\kappa }_{\text{metals}}};{{\kappa }_{\text{semiconductors}}}<{{\kappa }_{\text{insulators}}}=\text{zero}\]
D) \[{{\kappa }_{\text{metals}}}<{{\kappa }_{\text{semiconductors}}}>{{\kappa }_{\text{insulators}}}\ne \text{zero}\]
Correct Answer: A
Solution :
[a] Conductivity of metals are much higher than the semiconductors and insulators. Insulators are non - conductor of electricity. Thus, the order of conductivities of solids is \[{{\kappa }_{\text{metals}}}>>{{\kappa }_{\text{insulator}}}<{{\kappa }_{\text{semiconductors}}}\]
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