Solid State Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 17 - 20 of 68

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Question 17

Appeared in Year: 2013

Question

Match List-Ⅰ List-Ⅱ▾

Group contains elementary excitation in solids. Group 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)

Phonon

(i)

Collective electron oscillations

(B)

Plasmon

(ii)

Photon + lattice vibration

(C)

Polariton

(iii)

Electron + elastic deformation

(D)

Polaron

(iv)

Elastic wave

Choices

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

a.

  • (ii)
  • (iii)
  • (i)
  • (iv)

b.

  • (i)
  • (iv)
  • (iii)
  • (ii)

c.

  • (i)
  • (iii)
  • (iv)
  • (ii)

d.

  • (iv)
  • (i)
  • (ii)
  • (iii)

Question 18

Solid State Physics

Appeared in Year: 2011

Question

MCQ▾

The order of magnitude of the energy gap of a typical superconductor is –

Choices

Choice (4)Response

a.

b.

c.

d.

3 MeV

Question 19

Appeared in Year: 2011

Question

MCQ▾

The temperature dependence of magnetic susceptibility of a ferromagnetic substance with a Curie temperature is given by

Choices

Choice (4)Response

a.

b.

c.

d.

for all temperature where C is constant.

Question 20

Solid State Physics

Appeared in Year: 2013

Question

MCQ▾

The total energy of an ionic solid is given by an expression where is Madelung constant, is the distance between the nearest neighbors in the crystal and is a constant. If is the equilibrium separation between the nearest neighbors then the value of is –

Choices

Choice (4)Response

a.

b.

c.

d.

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