CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 239 - 241 of 463

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Question number: 239

» Condensed Matter Physics » Free Electron Theory

Appeared in Year: 2014

MCQ▾

Question

The dispersion relation for electron in an f. c. c. crystal is given, in the tight binding approximation, by ; where a is the lattice constant and is a constant with the dimension of energy. The x – component of the velocity of the electrons at is – (June – 2014)

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Choice (4) Response

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Question number: 240

» Electromagnetic Theory » Radiation- From Moving Charges

Appeared in Year: 2013

MCQ▾

Question

An oscillating current flows in the direction of the y – axis through a thin metal sheet of area kept in the plane. The rate of total energy radiated per unit area from the surfaces of the metal sheet at a distance of 100 m is – (June – 2013)

Choices

Choice (4) Response

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Question number: 241

» Quantum Mechanics » Timeindependent Perturbation Theory and Applications

Appeared in Year: 2013

MCQ▾

Question

A perturbation is added to the Hydrogen atom potential. The shift in the energy level of 2P state, when the effects of spin are neglected up to second order in , is – (Dec. 2013)

Choices

Choice (4) Response

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b.

c.

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