Atomic and Molecular Physics MCQs Question and Answer in Engineering Physics Page-2 section-1

11.
The number of fundamental vibrational modes of CO₂ molecule is

A. four : 2 are Raman active and 2 are infrared active

B. four : 1 is Raman active and 3 are infrared active

C. three : 1 is Raman active and 2 are infrared active

D. three : 2 are Raman active and 1 is infrared active

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12.
The spectrum of radiation emitted by a black body at a temperature 1000 K peaks in the

A. visible range of frequencies

B. infrared range of frequencies

C. ultraviolet range of frequencies

D. microwave range of frequencies

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13.
In a diatomic molecule, the inter-nuclear separation of the ground and first excited electronic state are the same as shown in the figure. If the molecule is initially in the lowest vibrational state of the ground state, then the absorption spectrum will appear as

A. Atomic and Molecular Physics mcq question image

B. Atomic and Molecular Physics mcq question image

C. Atomic and Molecular Physics mcq question image

D. Atomic and Molecular Physics mcq question image

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14.
The Lande g-factor for the $${}^3{p_1}$$ level of an atom is

A. $$\frac{1}{2}$$

B. $$\frac{3}{2}$$

C. $$\frac{5}{2}$$

D. $$\frac{7}{2}$$

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15.
A three-level system of atoms has N₁ atoms in level E₁, N₂ in level E₂ and N₃ in level E₃ (N₂ > N₁ > N₃ and E₁ < E₂ < E₃). Lasere mission is possible between the levels

A. E₃ → E₁

B. E₂ → E₁

C. E₃ → E₂

D. E₂ → E₃

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16.
The principal series of spectral lines of lithium is obtained by transitions between

A. ns and 2p, n > 2

B. nd and 2p, n > 2

C. np and 2s, n > 2

D. nf and 3d, n > 3

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17.
An atom with one outer electron having orbital angular momentum $$l$$ is placed in a weak magnetic field. The number of energy levels into which the higher total angular momentum state splits, is

A. 2$$l$$ + 2

B. 2$$l$$ + 1

C. 2$$l$$

D. 2$$l$$ - 1

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18.
In a He-Ne laser, the laser transition takes place in

A. He only

B. Ne only

C. Ne first, then in He

D. He first, then in Ne

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19.
Which one of the following electronic transitions in neon is not responsible for LASER action in a helium-neon laser?

A. 6s → 5p

B. 5s → 4p

C. 5s → 3p

D. 4s → 3p

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20.
The spin-orbit coupling constant for the upper state of sodium atom which emits D lines of wave numbers 16956.2 and 16973.4 cm^-1 is

A. 15 cm^-1

B. 11.4 cm^-1

C. 12.5 cm^-1

D. 15.1 cm^-1

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Atomic and Molecular Physics MCQs Question and Answer in Engineering Physics

11. The number of fundamental vibrational modes of CO2 molecule is

Answer & Solution

12. The spectrum of radiation emitted by a black body at a temperature 1000 K peaks in the

Answer & Solution

13. In a diatomic molecule, the inter-nuclear separation of the ground and first excited electronic state are the same as shown in the figure. If the molecule is initially in the lowest vibrational state of the ground state, then the absorption spectrum will appear as

Answer & Solution

14. The Lande g-factor for the $${}^3{p_1}$$ level of an atom is

Answer & Solution

15. A three-level system of atoms has N1 atoms in level E1, N2 in level E2 and N3 in level E3 (N2 > N1 > N3 and E1 < E2 < E3). Lasere mission is possible between the levels

Answer & Solution

16. The principal series of spectral lines of lithium is obtained by transitions between

Answer & Solution

17. An atom with one outer electron having orbital angular momentum $$l$$ is placed in a weak magnetic field. The number of energy levels into which the higher total angular momentum state splits, is

Answer & Solution

18. In a He-Ne laser, the laser transition takes place in

Answer & Solution

19. Which one of the following electronic transitions in neon is not responsible for LASER action in a helium-neon laser?

Answer & Solution

20. The spin-orbit coupling constant for the upper state of sodium atom which emits D lines of wave numbers 16956.2 and 16973.4 cm-1 is

Answer & Solution

11.
The number of fundamental vibrational modes of CO₂ molecule is

12.
The spectrum of radiation emitted by a black body at a temperature 1000 K peaks in the

13.
In a diatomic molecule, the inter-nuclear separation of the ground and first excited electronic state are the same as shown in the figure. If the molecule is initially in the lowest vibrational state of the ground state, then the absorption spectrum will appear as

14.
The Lande g-factor for the $${}^3{p_1}$$ level of an atom is

15.
A three-level system of atoms has N₁ atoms in level E₁, N₂ in level E₂ and N₃ in level E₃ (N₂ > N₁ > N₃ and E₁ < E₂ < E₃). Lasere mission is possible between the levels

16.
The principal series of spectral lines of lithium is obtained by transitions between

17.
An atom with one outer electron having orbital angular momentum $$l$$ is placed in a weak magnetic field. The number of energy levels into which the higher total angular momentum state splits, is

18.
In a He-Ne laser, the laser transition takes place in

19.
Which one of the following electronic transitions in neon is not responsible for LASER action in a helium-neon laser?

20.
The spin-orbit coupling constant for the upper state of sodium atom which emits D lines of wave numbers 16956.2 and 16973.4 cm^-1 is