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Model Questions

The document contains model questions for Unit 3 on Band Theory of Solids and Semiconductor Physics, covering topics such as energy bands, conductivity in semiconductors, and the construction of semiconductor devices. It also includes questions on Unit 4 regarding Superconductivity, discussing resistivity, critical magnetic fields, and the Meissner effect. Each question is designed to assess understanding of fundamental concepts in solid-state physics and semiconductor technology.

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21 views1 page

Model Questions

The document contains model questions for Unit 3 on Band Theory of Solids and Semiconductor Physics, covering topics such as energy bands, conductivity in semiconductors, and the construction of semiconductor devices. It also includes questions on Unit 4 regarding Superconductivity, discussing resistivity, critical magnetic fields, and the Meissner effect. Each question is designed to assess understanding of fundamental concepts in solid-state physics and semiconductor technology.

Uploaded by

madhuryar.01
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Model questions

UNIT – 3 [Band theory of solids and Semiconductor Physics]

1. What is an energy band? Explain the formation of energy bands in solids with an example of sodium.
[6mark]
2. Show that Magnesium is a conductor with the help of diagram showing the formation of energy bands due
to splitting of energy levels at inter-nuclear equilibrium distance. [5mark]
3. By representing the diagram of formation of energy bands due to splitting of energy levels at equilibrium
inter-nuclear distance, show that diamond is an insulator. [5mark]
4. By representing the diagram of formation of energy bands due to splitting of energy levels at equilibrium
inter-nuclear distance, show that silicon is a semiconductor. [5mark]
5. What are intrinsic and extrinsic semiconductors? Sketch the position of fermi energy level in intrinsic as
well as extrinsic (p-type & n-type) semiconductors. [5mark]
6. Write the expressions for electrical conductivity for intrinsic and extrinsic semiconductor with the
meaning of symbols involved in the formulae. [4mark]
7. Describe the construction and working of semiconductor diode laser. [10mark]
8. What is a photodiode? Explain briefly the construction and working of p-n photodiode in reverse bias with
suitable diagram. [8mark]
9. Explain Hall Effect in semiconductor with suitable diagram. Obtain the expression for Hall voltage in
terms of Hall co-efficient. [10mark]
10. Define Hall co-efficient. Obtain the expression for Hall co-efficient in terms of Hall voltage. Mention any
two applications of Hall Effect. [10mark]

UNIT – 4 [Superconductivity]

1. Explain the temperature dependence of resistivity of a normal conductor and superconductor with the help
of suitable graph. [8mark]
2. Define critical magnetic field. Explain the dependence of critical magnetic field on temperature with the
help of neat graph. Give the mathematical relationship between the two. [6mark]
3. Define critical current. Give the expression for critical current in terms of critical field. [4mark]
4. Explain Meissner effect. Show that a superconductor shows perfect diamagnetic nature. [6mark]
5. Explain Type-I and Type-II superconductor with the help of suitable diagrams. [10mark]
6. What are cooper pairs? Explain briefly the BCS theory of superconductivity. [6mark]

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