GATE (Graduate Aptitude Test in Engineering) Physics: Questions 9 - 12 of 659

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Question 9

Appeared in Year: 2014

Question

MCQ▾

The energy, for band electrons as a function of the wave vector, in the first Brillouin zone of a one dimensional monatomic lattice is shown as ( is lattice constant)

The Energy as a Function of the Wave Vector

The variation of the group velocity is most appropriately represented by

Choices

Choice (4)Response

a.

The Variation of the Group Velocity - Choice – A

b.

The Variation of the Group Velocity - Choice – B

c.

The Variation of the Group Velocity - Choice – C

d.

The Variation of the Group Velocity - Choice – D

Question 10

Residue Theorem and Applications

Appeared in Year: 2015

Write in Short

Short Answer▾

The value of is ________ (up to one decimal place)

Question 11

Appeared in Year: 2015

Write in Short

Short Answer▾

A beam of X – ray of intensity is incident normally on a metal sheet of thickness 2 mm. The intensity of the transmitted beam is . The linear absorption coefficient of the metal sheet (in per m) is ________ (up to one decimal place) .

Question 12

Appeared in Year: 2016

Question

MCQ▾

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

Choices

Choice (4)Response

a.

is independent of

b.

c.

d.

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