CSIR Physical Sciences: Questions 338 - 340 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: 338

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2011

MCQ▾

Question

Assume that the free energy of a magnetic system has an expansion in the order parameter M of the form F(M,T)=a(TTC)M2+bM4+cM6 , with a,bandc>0 . As the temperature is lowered below TC , the system undergoes a phase transition. The behaviour of the order parameter just below the transition, where (TTC) is very small, is best described by – (December)

Choices

Choice (4) Response
a.

M(TCT)3

b.

M(TCT)12

c.

M(TCT)

d.

M(TCT)12

Question number: 339

» Atomic & Molecular Physics » LS & JJ Couplings

Appeared in Year: 2012

MCQ▾

Question

The spectral line corresponding to an atomic transition from J=1toJ=0 states splits in a magnetic field of 1 KG into three components separated by 1.6×103 . If the zero field spectral line corresponding to 1849 , what is the g – factor corresponding to the J=1 state? (You may use hcμ02×104cm ) (June)

Choices

Choice (4) Response
a.

32

b.

12

c.

2

d.

1

Question number: 340

» Atomic & Molecular Physics » LS & JJ Couplings

Appeared in Year: 2011

MCQ▾

Question

If the hyperfine interaction in an atom is given by H=aSeSp , where Se and Sp denote the electron and proton spins, respectively, the splitting between the 3S1 and 1S0 state is – (December)

Choices

Choice (4) Response
a.

a2

b.

a22

c.

a22

d.

2a2

Sign In