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Worksheets

spectroscopy

Total questions: 20

Worksheet time: 10mins

Name
Class
Date
1.

Vibrating diatomic molecule obeys

a)

Hookes law

b)

Law of motion

c)

Law of conservation of energy

d)

none

2.

Q Branch

a)

DJ=0

b)

DJ = ±1

c)

DJ=-1

d)

DJ =1

3.

P Branch

a)

DJ=0

b)

DJ=1

c)

DJ=-1

d)

DJ=±1

4.

R Branch

a)

DJ = ±1

b)

DJ = 0

c)

DJ = +1

d)

DJ = -1

5.

BAND CENTER OCCURS AT

a)

b)

eXe

c)

osc

d)

0

6.

Zero point energy of S.H.O is

a)

osc

b)

e

c)

1/2 ⍵osc

d)

ALL

7.

Hertz can be converted cm-1 dividing by

a)

hc

b)

h

c)

h/n

d)

h/⍵

8.

Selection rule for SHO is

a)

Dv =0

b)

Dv =0,±1

c)

Dv =±1

d)

none

9.

Selection rule for anharmonic oscillator

a)

Dv =±1

b)

Dv =0,±1

c)

Dv =±1,±2,±3

d)

none

10.

MOARSE CURVE IS THE PLOT OF

a)

ENERGY VERSUS BONDLENGTH

b)

ENERGY VERSUS BOND DISSOCIATION ENERGY

c)

ENERGY VERSUS INTERNUCLEAR DISTANCE

d)

DISSOCIATION ENERGY VERSUS INTERNUCLEAR DISTANCE

11.

First overtone occurs at

a)

e(1-4Xe)

b)

e(1-3Xe)

c)

2⍵e(1-3Xe)

d)

e(1-Xe)

12.

Xe is called

a)

Rotational constant

b)

Anharmonicity constant

c)

Oscillation frequency

d)

Wavenumber

13.

HOT BANDS OCCURS AT

a)

e(1-4Xe)

b)

e(1-2Xe)

c)

e(1-3Xe)

d)

2⍵e(1-2Xe)

14.

DJ = -2

a)

Q BRANCH

b)

S BRANCH

c)

P BRANCH

d)

O BRANCH

15.

HOT BANDS OCCUR AT

a)

HIGH TEMPERATURE

b)

LOW TEMPERATURE

c)

HIGH INTENSITY

d)

LOW INTENSITY

16.

IN ALL BRANCHES OF SPECTROSCOPY THE UPPER LEVEL IS REPRESENTED BY

a)

SINGLE PRIME

b)

DOUBLE PRIME

c)

ZERO

d)

NONE

17.

In S.H.O Oscillator, the energy levels are

a)

EQUALLY SPACED

b)

INCREASING SPACING

c)

DECREASING SPACING

d)

NONE

18.

Fundamental vibration occurs at

a)

e(1-Xe)

b)

e(1-2Xe)

c)

2⍵e(1-2Xe)

d)

e(1-3Xe)

19.

In vibrational spectroscopy v is called

a)

vibrational quantum number

b)

rotational quantum number

c)

oscillation quantum number

d)

none

20.

Condition for the molecule to be vibrational active

a)

permanent dipole moment

b)

change in dipolemoment

c)

change in polarisibility of the molecule

d)

All