CSIR Physical Sciences: Questions 284 - 287 of 389

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 389 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 250.00 or

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 M=tanh(TCTM+HT) . In these units, the zero – field magnetic susceptibility in terms of M(0)=M(H=0) is given by, (June)

Choices

Choice (4) Response
a.

1M2(0)TTC(1M2(0))

b.

1M2(0)T

c.

1M2(0)TTC

d.

1M2(0)T+TC

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 fcc structure, in which the volume of the unit cell is a3 is –

(December)

Choices

Choice (4) Response
a.

(3π2a3)13

b.

1a

c.

(12π2a3)13

d.

(π2a3)13

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 H=aLS where L and S denote the orbital and spin angular momenta, respectively of the electron. The splitting between the levels 2P32 and 2P12 is – (June)

Choices

Choice (4) Response
a.

12a2

b.

52a2

c.

32a2

d.

3a2

Question number: 287

» Condensed Matter Physics » Band Theory of Solids » Semiconductors

Appeared in Year: 2012

MCQ▾

Question

In a band structure calculation, the dispersion for electrons is found to be, εk=β(coskxa+cosky+coskza) Where β is a constant and a is the lattice constant. The effective mass at the boundary of the first Brillouin zone is – (December)

Choices

Choice (4) Response
a.

225βa2

b.

2βa2

c.

22βa2

d.

425βa2

Sign In