Condensed Matter Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 17 - 19 of 19

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Question number: 17

» Condensed Matter Physics » Reciprocal Lattice

Appeared in Year: 2016

MCQ▾

Question

Consider a hexagonal lattice with basis vectors as shown in the figure below.

 A hexagonal lattice

a Hexagonal Lattice

In figure a hexagonal lattice is shown.

If the lattice spacing is , the reciprocal lattice vectors are: (December)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 18

» Condensed Matter Physics » Diffraction and the Structure Factor

Appeared in Year: 2016

MCQ▾

Question

Consider a one – dimensional chain of atoms with lattice constant . The energy of an electron with wave – vector is , where and are constants. If an electric field is applied in the positive direction, the time dependent velocity of an electron is:

(In the following is the constant) (December)

Choices

Choice (4) Response

a.

proportional of

b.

proportional to

c.

proportional to

d.

independent of

Question number: 19

» Condensed Matter Physics » Hall Effect and Thermoelectric Power

Appeared in Year: 2016

MCQ▾

Question

A thin rectangular conducting plate of length and width is placed in the plane in two different orientations, as shown in the figures below. In both cases a magnetic field is applied in the direction due to the applied voltage .

A thin rectangular conducting plate (1)

A Thin Rectangular Conducting Plate (1)

In figure, a thin rectangular conducting plate is shown.

A thin rectangular conducting plate (2)

A Thin Rectangular Conducting Plate (2)

In figure a thin rectangular conducting plate is shown.

If the Hall voltage across the direction in the two cases satisfy , the ratio must be: (December)

Choices

Choice (4) Response

a.

b.

c.

d.

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