Atomic and Molecular Physics MCQs Question and Answer in Engineering Physics Page-8 section-1

71.
Assuming that the L-S coupling scheme is valid, the number of permitted transitions from ²P_3/2 to ²s_1/2 due to a weak magnetic field is

A. 2

B. 4

C. 6

D. 10

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72.
The D₁ and D₂ lines of Na(3²p_1/2 → 3²s_1/2, 3²p_3/2 → 3²s_1/2) will split on the application of a weak magnetic field into

A. 4 and 6 lines respectively

B. 3 lines each

C. 6 and 4 lines respectively

D. 6 lines each

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73.
The NMR spectrum of ethanol (CH₃CH₂OH) comprises of three bunches of spectral lines. The number of spectral lines in the bunch corresponding to CH₂ group is

A. 1

B. 2

C. 3

D. 4

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74.
In the microwave spectrum of identical rigid diatomic molecules, the separation between the spectral lines is recorded to be 0.7143 cm^-1. The moment of inertia of the molecule, in kg-m² is

A. 2.3 × 10^-36

B. 2.3 × 10^-40

C. 7.8 × 10^-42

D. 7.8 × 10^-46

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75.
The typical wavelengths emitted by diatomic molecules in purely vibrational and purely rotational transitions are respectively in the region of

A. infrared and visible

B. visible and infrared

C. infrared and microwave

D. microwave and infrared

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76.
The target of an X-ray tube is subjected to an excitation voltage V. The wavelength of the emitted X-rays is proportional to

A. $$\frac{1}{{\sqrt V }}$$

B. $$\sqrt V $$

C. $$\frac{1}{V}$$

D. $$V$$

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77.
In a two-electron atomic system having orbital and spin angular momenta $${l_1}{l_2}$$ and $${s_1}{s_2}$$ respectively, the coupling strengths are defined as $${\Gamma _{{l_1}{l_2}}},\,{\Gamma _{{s_1}{s_2}}},\,{\Gamma _{{l_1}{s_1}}},\,{\Gamma _{{l_2}{s_2}}},\,{\Gamma _{{l_1}{l_2}}}$$ and $${\Gamma _{{l_2}{s_1}}}.$$ For the jj coupling. scheme to be applicable, the coupling strengths must satisfy the condition

A. $${\Gamma _{{l_1}{l_2}}},\,{\Gamma _{{s_1}{s_2}}} > {\Gamma _{{l_1}{s_1}}},\,{\Gamma _{{l_2}{s_2}}}$$

B. $${\Gamma _{{l_1}{s_1}}},\,{\Gamma _{{l_2}{s_2}}} > {\Gamma _{{l_1}{l_2}}},\,{\Gamma _{{s_1}{s_2}}}$$

C. $${\Gamma _{{l_1}{s_2}}},\,{\Gamma _{{l_2}{s_1}}} > {\Gamma _{{l_1}{l_2}}},\,{\Gamma _{{s_1}{s_2}}}$$

D. $${\Gamma _{{l_1}{s_2}}},\,{\Gamma _{{l_2}{s_1}}} > {\Gamma _{{l_1}{s_1}}},\,{\Gamma _{{l_2}{s_2}}}$$

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Atomic and Molecular Physics MCQs Question and Answer in Engineering Physics

71. Assuming that the L-S coupling scheme is valid, the number of permitted transitions from 2P3/2 to 2s1/2 due to a weak magnetic field is

Answer & Solution

72. The D1 and D2 lines of Na(32p1/2 → 32s1/2, 32p3/2 → 32s1/2) will split on the application of a weak magnetic field into

Answer & Solution

73. The NMR spectrum of ethanol (CH3CH2OH) comprises of three bunches of spectral lines. The number of spectral lines in the bunch corresponding to CH2 group is

Answer & Solution

74. In the microwave spectrum of identical rigid diatomic molecules, the separation between the spectral lines is recorded to be 0.7143 cm-1. The moment of inertia of the molecule, in kg-m2 is

Answer & Solution

75. The typical wavelengths emitted by diatomic molecules in purely vibrational and purely rotational transitions are respectively in the region of

Answer & Solution

76. The target of an X-ray tube is subjected to an excitation voltage V. The wavelength of the emitted X-rays is proportional to

Answer & Solution

Answer & Solution

71.
Assuming that the L-S coupling scheme is valid, the number of permitted transitions from ²P_3/2 to ²s_1/2 due to a weak magnetic field is

72.
The D₁ and D₂ lines of Na(3²p_1/2 → 3²s_1/2, 3²p_3/2 → 3²s_1/2) will split on the application of a weak magnetic field into

73.
The NMR spectrum of ethanol (CH₃CH₂OH) comprises of three bunches of spectral lines. The number of spectral lines in the bunch corresponding to CH₂ group is

74.
In the microwave spectrum of identical rigid diatomic molecules, the separation between the spectral lines is recorded to be 0.7143 cm^-1. The moment of inertia of the molecule, in kg-m² is

75.
The typical wavelengths emitted by diatomic molecules in purely vibrational and purely rotational transitions are respectively in the region of

76.
The target of an X-ray tube is subjected to an excitation voltage V. The wavelength of the emitted X-rays is proportional to