Atomic & Molecular Physics-Diatomic Molecules (CSIR Physical Sciences): Questions 1 - 3 of 3

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: 1

» Atomic & Molecular Physics » Diatomic Molecules » Vibrational

Appeared in Year: 2014

MCQ▾

Question

If the leading anharmonic correction to the energy of the energy of nth vibrational level of a diatomic molecule is xe(n+12)2ω with xe=0.001 , the total number of energy levels possible is approximately, (December)

Choices

Choice (4) Response

a.

1000

b.

250

c.

500

d.

750

Question number: 2

» Atomic & Molecular Physics » Diatomic Molecules » Vibrational

Appeared in Year: 2013

MCQ▾

Question

The phonon dispersion for the following one – dimensional diatomic lattice with masses M1 and M2 (as shown in figure)

Diagram of phonon dispersion

Diagram of Phonon Dispersion

In figure the phonon dispersion for the following one – dimensional diatomic lattice with masses M1 and M2.

is given by, ω2(q)=K(1M1+1M2)[1±14M1M2M1+M2sin2(qa2)]

where a is the lattice parameter and K is the spring constant. The velocity of sound is – (June)

Choices

Choice (4) Response

a.

K(M1+M2)2M1M2a

b.

K(M1+M2)M1M2a

c.

K2(M1+M2)a

d.

KM1M22(M1+M2)3a

Question number: 3

» Atomic & Molecular Physics » Diatomic Molecules » Vibrational

Appeared in Year: 2012

MCQ▾

Question

A system has two normal modes of vibration, with frequencies ω1 and ω2=2ω1 . What is the probability that at temperature T, the system has an energy less than 4ω1 ?

[In the following x=eβω1 and Z is the partition function of the system]

(June)

Choices

Choice (4) Response

a.

x32(1+x+x2)Z

b.

x32(x+2x2)Z

c.

x32(1+x+2x2)Z

d.

x32(1+2x2)Z

Sign In