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HC Verma - Concepts of Physics Part 2

45. Semiconductors and Semiconductor Devices

23. Heat and Temperature
24. Kinetic Theory of Gases
25. Calorimetry
26. Laws of Thermodynamics
27. Specific Heat Capacities of Gases
28. Heat Transfer
29. Electric Field and Potential
30. Gauss’s Law
31. Capacitors
32. Electric Current in Conductors
33. Thermal and Chemical effects of Electric Current
34. Magnetic Field
35. Magnetic Field due to a Current
36. Permanent Magnets
37. Magnetic Properties of Matter
38. Electromagnetic Induction
39. Alternating Current
40. Electromagnetic Waves
41. Electric Current through Gases
42. Photoelectric Effect and Wave-Particle Duality
43. Bohr’s Model and Physics of the Atom
44. X-rays
45. Semiconductors and Semiconductor Devices
46. The Nucleus
47. The Special Theory of Relativity

Short Answer

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Objective I

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Objective II

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Exercises

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Q. 115.0( 1 Vote )

The conductivity

Class 12th HC Verma - Concepts of Physics Part 2 45. Semiconductors and Semiconductor Devices

Answer :

Given:

At temperature 4K, E₁= 0.74

At temperature 300K, E₂=0.67

The conductivity is proportional to T^3/2 e^–ΔE/2kT,

Let conductivity at 4K be =σ₁

and at 300k be = σ₂

∴

∴ conductivity increases by the factor of

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