Condensed Matter Physics [CSIR (Council of Scientific & Industrial Research) Physical Sciences]: Questions 1 - 4 of 29

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Question 1

Appeared in Year: 2012

Question MCQ▾

The experimentally measured transmission spectra of metal, insulator and semiconductor thin films are shows in the figure. It can be inferred that I, II and III correspond respectively, to – (June)

Plot of Transmission Spectra V/S Wavelength

Choices

Choice (4)Response

a.

Metal, semiconductor and insulator

b.

Semiconductor, metal and insulator

c.

Insulator, semiconductor and metal

d.

Insulator, metal and semiconductor

Edit

Question 2

Appeared in Year: 2014

Question MCQ▾

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)

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 3

Appeared in Year: 2014

Question MCQ▾

Consider an electron in a b. c. c. lattice with lattice constant . A single particle wavefunction that satisfies the Bloch theorem will have the form , with being – (June – 2014)

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 4

Appeared in Year: 2014

Question MCQ▾

The following data is obtained in an experiment that measures the viscosity as a function of molecular weight M for a set of polymers.

In Table, the List of Data is Obtained in an Experiment to Measure the Viscosity is Given

The relation that best describes the dependence of on M is – (June – 2014)

Choices

Choice (4)Response

a.

b.

c.

d.

Edit