Atomic and Molecular Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 22 - 26 of 58

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Question 22

Atomic and Molecular Physics

Appeared in Year: 2010

Question

MCQ▾

To detect trace amount of a gaseous species in a mixture of gases, the preferred probing tools is –

Choices

Choice (4)Response

a.

ESR spectroscopy

b.

Laser spectroscopy

c.

NMR spectroscopy

d.

Ionization spectroscopy with – rays

Question 23

Appeared in Year: 2010

Question

MCQ▾

The first three energy levels of are shown below

The expected spin – parity and energy of the next level are given by –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 24

Appeared in Year: 2010

Question

Match List-Ⅰ List-Ⅱ▾

Match the typical spectra of stable molecules with the corresponding wave number range –

List-Ⅰ (Group I)List-Ⅱ (Group II)
(A)

Electronic spectra

(i)

and above

(B)

Molecular spectra

(ii)

(C)

Rotational spectra

(iii)

Choices

Choice (4)Response
  • (A)
  • (B)
  • (C)

a.

  • (ii)
  • (iii)
  • (i)

b.

  • (ii)
  • (i)
  • (iii)

c.

  • (i)
  • (iii)
  • (ii)

d.

All of the above

Question 25

Appeared in Year: 2010

Question

MCQ▾

The three principal moments of inertia of a methanol molecule have the property and . The rotational energy eigenvalues are –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 26

Appeared in Year: 2009

Question

MCQ▾

Five energy levels of a system including the ground state are shown below. Their lifetimes and the allowed electric dipole transitions are also marked.

Energy Level Diagram

Which one of the following transition is the most suitable for a continuous wave (CW) laser?

Choices

Choice (4)Response

a.

b.

c.

d.

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