Solid State Physics (GATE Physics): Questions 1 - 4 of 30

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Question number: 1

» Solid State Physics » Nearly Free Electron and Tight Binding Models

Appeared in Year: 2016

MCQ▾

Question

Consider a metal which obeys the Sommerfeld model exactly. If EF is the Fermi energy of the metal at T=0K and RH is its Hall coefficient, which of the following statement is correct?

Choices

Choice (4) Response

a.

RH is independent of EF

b.

RHEF32

c.

RHEF32

d.

RHEF23

Question number: 2

» Solid State Physics » Elements of Crystallography

Appeared in Year: 2015

Short Answer Question▾

Write in Short

The lattice parameters a,b,c of an orthorhombic crystal are related by a=2b=3c . In units of a , the inter-planar separation between the (110) planes is ________ (up to three decimal places)

Question number: 3

» Solid State Physics » Lattice Vibrations and Thermal Properties of Solid

Appeared in Year: 2015

Short Answer Question▾

Write in Short

The dispersion relation for phonons in a one dimensional monatomic Bravais lattice with lattice spacing a and consisting of ions of masses M is given by,

ω(k)=2CM[1cos(ka)]

Where ω is the frequency of oscillation, k is the wavevector and C is the spring constant. For the long wavelength modes (λa) , the ratio of the phase velocity to the group velocity is ________.

Question number: 4

» Solid State Physics » Elements of Superconductivity » Type-I and Type-II Superconductors

Appeared in Year: 2015

MCQ▾

Question

Which one of the following represents the electron occupancy for a superconductor in its normal and superconducting states?

Choices

Choice (4) Response

a.

The electron occupancy: Choice A

The Electron Occupancy: Choice A

In figure the electron occupancy for normal state and superconducting state are given by graphs.

b.

The electron occupancy: Choice B

The Electron Occupancy: Choice B

In figure the electron occupancy for normal state and superconducting state are given by graphs.

c.

The electron occupancy: Choice C

The Electron Occupancy: Choice C

In figure the electron occupancy for normal state and superconducting state are given by graphs.

d.

The electron occupancy: Choice D

The Electron Occupancy: Choice D

In figure the electron occupancy for normal state and superconducting state are given by graphs.

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