CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 283 - 286 of 463

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Question number: 283

» 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 . The specifications require a magnetic field sensitivity of at an excitation current of . The implantation dose is to be adjusted such that the average carrier density, after activation, is – (December)

Choices

Choice (4) Response

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b.

c.

d.

Question number: 284

» Thermodynamic and Statistical Physics » Ferromagnetism

Appeared in Year: 2012

MCQ▾

Question

The magnetization M of a ferro-magnet, as a function of the temperature T and the magnetic field H, is described by the equation . In these units, the zero – field magnetic susceptibility in terms of is given by, (June)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 285

» 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 structure, in which the volume of the unit cell is is –

(December)

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Choice (4) Response

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b.

c.

d.

Question number: 286

» Atomic & Molecular Physics » LS & JJ Couplings

Appeared in Year: 2012

MCQ▾

Question

The spin orbit interaction in an atom is given by where L and S denote the orbital and spin angular momenta, respectively of the electron. The splitting between the levels and is – (June)

Choices

Choice (4) Response

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b.

c.

d.

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