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Question

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

(a)  Kmetals >> Kinsulators < Ksemiconductors

(b)  Kmetals << Kinsulators < Ksemiconductors

(c)  Kmetals.,Ksemiconductors > Kinsulators=zero

(d)  Kmetals < Ksemiconductors > Kinsulatorszero


Solution

Answer: (a)  The conductivity of metal, insulator, and semiconductors can be represented in the form of k (kappa ) which depends upon the energy gap between the valence band and the conduction band.

Hence, correct order is

Kmetals >> Kinsulators < Ksemiconductors

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