Solid State Physics-Lattice Vibrations and Thermal Properties of Solid (GATE Physics): Questions 1 - 3 of 6

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Question number: 1

» 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 Equation and consisting of ions of masses M is given by,

Equation

Where Equation is the frequency of oscillation, Equation is the wavevector and C is the spring constant. For the long wavelength modes Equation , the ratio of the phase velocity to the group velocity is ________.

Question number: 2

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

Appeared in Year: 2013

Match List-Ⅰ List-Ⅱ▾

Question

Group I contains elementary excitation in solids. Group II gives the associated fields with these excitations. MATCH the excitations with their associated field and select your answer as per codes given below.
List-Ⅰ (Group I) List-Ⅱ (Group II)

(A)

Polaron

(i)

Elastic wave

(B)

Phonon

(ii)

Electron + elastic deformation

(C)

Polariton

(iii)

Photon + lattice vibration

(D)

Plasmon

(iv)

Collective electron oscillations

Choices

Choice (4) Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (iv)
  • (iii)
  • (ii)
  • (i)

b.

  • (iii)
  • (i)
  • (ii)
  • (iv)

c.

  • (ii)
  • (i)
  • (iii)
  • (iv)

d.

  • (iii)
  • (ii)
  • (i)
  • (iv)

Passage

The primitive translation vectors of the face centered cubic Equation lattice are

Equation

Question number: 3 (1 of 2 Based on Passage) Show Passage

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

Appeared in Year: 2009

MCQ▾

Question

The primitive translation vectors of the Equation reciprocal lattice are –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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