Thermodynamic and Statistical Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 50 - 52 of 64

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Question number: 50

» Thermodynamic and Statistical Physics » Maxwell Relations

Appeared in Year: 2012

MCQ▾

Question

The energy required to create a lattice vacancy in a crystal is equal to Equation . The ratio of the number densities of vacancies Equation , when crystal is equilibrium at 1200 K and 300 K, respectively, is approximately, (June)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 51

» Thermodynamic and Statistical Physics » Fermi Gases

Appeared in Year: 2011

MCQ▾

Question

The energy levels of electrons of mass ‘m’ and charge ‘e’ confined in an area A in the xy – plane with a uniform magnetic field B applied in the z – direction are given by Equation the degeneracy of each level is Equation . The lowest level is completely filled and the others are empty. The Fermi energy Equation , where, N is the total number of electrons, is – (December)

Choices

Choice (4) Response

a.

Coincident with the Equation level

b.

Midway between the Equation and the Equation levels

c.

Midway between the Equation and the Equation levels

d.

Coincident with the Equation level

Question number: 52

» Thermodynamic and Statistical Physics » Diffusion Equation

Appeared in Year: 2011

MCQ▾

Question

Consider two independently diffusing non-interacting in 3 – dimensional space, both placed at the origin at time Equation . These particles have different diffusion constants Equation and Equation . The quantity Equation where Equation and Equation are the positions of the particles at time Equation , behaves as – (June)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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