CSIR Physical Sciences: Questions 378 - 381 of 401

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Question number: 378

» Thermodynamic and Statistical Physics » Classical and Quantum Statistics

Appeared in Year: 2012

MCQ▾

Question

The dispersion relation of phonons in a solid is given by Equation . The velocity of the phonons at large wavelength is, (June)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Passage

In a system consisting of two spin Equation particles labeled 1 and 2, let Equation and Equation denote the corresponding spin operators. Here, Equation and Equation are the three Pauli matrices. (June)

Question number: 379 (1 of 2 Based on Passage) Show Passage

» Quantum Mechanics » Spin-Statistics Connection

Appeared in Year: 2011

MCQ▾

Question

These two operators satisfy the relation,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 380 (2 of 2 Based on Passage) Show Passage

» Quantum Mechanics » Spin-Statistics Connection

Appeared in Year: 2011

MCQ▾

Question

In the standard basis the matrices for the operators Equation and Equation respectively,

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Passage

The two dimensional lattice of graphene is an arrangement of Carbon atoms forming a honeycomb lattice of lattice spacing Equation , as shown below. The Carbon atoms occupy the vertices. (June)

The two dimensional lattice

The Two Dimensional Lattice

In figure the two dimensional lattice of graphene is an arrangement of Carbon atoms forming a honeycomb lattice spacing a is shown.

Question number: 381 (1 of 2 Based on Passage) Show Passage

» Condensed Matter Physics » Bravais Lattices

Appeared in Year: 2011

MCQ▾

Question

The Bravais lattice for this array is a –

Choices

Choice (4) Response

a.

Rectangular lattice with basis vector Equation and Equation

b.

Hexagonal lattice with basis vector Equation and Equation

c.

Rectangular lattice with basis vector Equation and Equation

d.

Hexagonal lattice with basis vector Equation and Equation

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