CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 378 - 382 of 463

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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 . The velocity of the phonons at large wavelength is, (June)

Choices

Choice (4) Response

a.

b.

c.

d.

Passage

In a system consisting of two spin particles labeled 1 and 2, let and denote the corresponding spin operators. Here, and 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

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

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 380 (2 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.

b.

c.

d.

Passage

The two dimensional lattice of graphene is an arrangement of Carbon atoms forming a honeycomb lattice of lattice spacing , 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.

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» Condensed Matter Physics » Bravais Lattices

Appeared in Year: 2011

MCQ▾

Question

The Wigner – Seitz cell has an area of –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 382 (2 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 and

b.

Hexagonal lattice with basis vector and

c.

Rectangular lattice with basis vector and

d.

Hexagonal lattice with basis vector and

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