PG TRB phy Unit 6

The rotational Raman shift should be equal to_______ the frequency of rotation of molecule

• Thrice

• Fourtimes

• Twice

• Five times

The transfer of excess energy of the spins in the upper state to the surrounding is called

• Spin spin relaxation

• Spin lattice relaxation

• Dipole dipole relaxation

• Dipole lattice relaxation

The number of modes of vibration for a non linear molecule having n atoms is

• 3n-6

• 3n-5

• 3n-4

• 3n-2

If mass number and atomic number are even the nuclear spin is

• 1

• -1/2

• +1/2

• 0

The scattering efficiency is inversely proportional to the fourth power of

• Wave length

• Frequency

• Oscillation

• Resonance

The component of NMR spectrometer

• Electromagnet

• rf oscillator

• rf receiver

• All the above

The hyperfine splitting of atomic levels is due to

• Spin orbit interaction

• Electron spin electron spin interaction

• Relativistic correction

• Electron spin Nuclear spin interaction

According to Franck Condon principle during an electronic transition of vibrating molecule the intermolecular distance

• Does not change appreciable

• Rapidly change

• Partially change

• Change appreciably

For an atom the electric quadrupole interaction occurs only when the nuclear spin value is

• >1/2

• 1/2

• -1/2

• 0

When the temperature increased the intensity of Raman anti Stokes line

• Increases

• Decreases

• Remains same

• Zero