Atomic & Molecular Physics (CSIR Physical Sciences): Questions 10 - 12 of 18

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Question number: 10

» Atomic & Molecular Physics » Rate Equation

Appeared in Year: 2012

MCQ▾

Question

Consider a He – Ne laser cavity consisting of two mirrors of reflectivity R1=1 and R2=0.98 . The mirrors are separated by a distance d=20cm and the medium in between has a refractive index n0=1 and absorption coefficient α=0 . The values of the separation between the modes δv and the width Δvp of each mode of the laser cavity are – (December)

Choices

Choice (4) Response

a.

δv=75kHz,Δvp=24kHz

b.

δv=750MHz,Δvp=2.4MHz

c.

δv=100kHz,Δvp=100kHz

d.

δv=2.4MHz,Δvp=750MHz

Question number: 11

» 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

Question number: 12

» 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

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