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)
Choices
Choice (4) | Response | |
---|---|---|
a. | Metal, semiconductor and insulator | |
b. | Semiconductor, metal and insulator | |
c. | Insulator, semiconductor and metal | |
d. | Insulator, metal and semiconductor |
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. |
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. |
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.
The relation that best describes the dependence of on M is – (June – 2014)
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |