CSIR Physical Sciences: Questions 349 - 351 of 401

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 401 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 300.00 or

Question number: 349

» Atomic & Molecular Physics » Born-Oppenheimer Approximation

Appeared in Year: 2011

MCQ▾

Question

The difference in the Coulomb energy between the mirror nuclei Cr and Mn is 6.0MeV . Assuming that the nuclei have a spherically symmetric charge distribution and that e2 is approximately 1.0MeVfm the radius of the Mn nucleus is – (December)

Choices

Choice (4) Response

a.

4.9×1013m

b.

5.1×1015m

c.

4.9×1015m

d.

5.1×1013m

Question number: 350

» Quantum Mechanics » Timeindependent Perturbation Theory and Applications

Appeared in Year: 2012

MCQ▾

Question

Consider an electron in a box of length L with periodic boundary condition ψ(x)=ψ(x+L) . If the electron is in the ψk(x)=1Leikx with energy εk=2k22m , what is the correction to its energy, to second order of perturbation theory, when it is subjected to weak periodic potential V(x)=V0cosgx , where g is an integral multiple of the 2πL ? (June)

Choices

Choice (4) Response

a.

V02(εkεg)εg2

b.

V02εk+εg

c.

mV0222(1g2+2kg+1g22kg)

d.

V02εgεk2

Question number: 351

» Thermodynamic and Statistical Physics » Brownian Motion

Appeared in Year: 2011

MCQ▾

Question

A gas of N non- interacting particles is in thermal equilibrium at temperature T. Each particle can be in any of the possible non – degenerate state of energy 0,2εand4ε . The average energy per particle of the gas, when βε1 , is – (December)

Choices

Choice (4) Response

a.

ε

b.

2ε3

c.

2ε

d.

3ε

Sign In