Condensed Matter Physics (CSIR Physical Sciences): Questions 7 - 9 of 16

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Question number: 7

» Condensed Matter Physics » Hall Effect and Thermoelectric Power

Appeared in Year: 2012

MCQ▾

Question

A magnetic field sensor based on the Hall effect is to be fabricated by implanting As into a Si film of thickness 1μm . The specifications require a magnetic field sensitivity of 500mVTesla at an excitation current of 1mA . The implantation dose is to be adjusted such that the average carrier density, after activation, is – (December)

Choices

Choice (4) Response
a.

4.1×1020m3

b.

1.25×1022m3

c.

1.25×1026m3

d.

4.1×1021m3

Question number: 8

» Condensed Matter Physics » Bonding of Solids

Appeared in Year: 2012

MCQ▾

Question

The radius of the Fermi sphere of free electrons in a monovalent metal with an fcc structure, in which the volume of the unit cell is a3 is –

(December)

Choices

Choice (4) Response
a.

(3π2a3)13

b.

1a

c.

(12π2a3)13

d.

(π2a3)13

Question number: 9

» Condensed Matter Physics » Band Theory of Solids » Semiconductors

Appeared in Year: 2012

MCQ▾

Question

In a band structure calculation, the dispersion for electrons is found to be, εk=β(coskxa+cosky+coskza) Where β is a constant and a is the lattice constant. The effective mass at the boundary of the first Brillouin zone is – (December)

Choices

Choice (4) Response
a.

225βa2

b.

2βa2

c.

22βa2

d.

425βa2

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