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

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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 Equation vibrational level of a diatomic molecule is Equation withEquation , 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 Equation and Equation (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, Equation

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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 Equation and Equation . What is the probability that at temperature T, the system has an energy less than Equation ?

[In the following Equation and Z is the partition function of the system]

(June)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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