Atomic And Molecular Physics - Study Mode

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[#41] Assuming that the L-S coupling scheme is valid, the number of permitted transitions from 2 P 3/2 to 2 s 1/2 due to a weak magnetic field is

(A) 2

(B) 4

(C) 6

(D) 10

Correct Answer

(C) 6

[#42] The D 1 and D 2 lines of Na(3 2 p 1/2 → 3 2 s 1/2 , 3 2 p 3/2 → 3 2 s 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

Correct Answer

(A) 4 and 6 lines respectively

[#43] The NMR spectrum of ethanol (CH 3 CH 2 OH) comprises of three bunches of spectral lines. The number of spectral lines in the bunch corresponding to CH 2 group is

(A) 1

(B) 2

(C) 3

(D) 4

Correct Answer

(D) 4

[#44] 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-m 2 is

(A) 2.3 × 10 -36

(B) 2.3 × 10 -40

(C) 7.8 × 10 -42

(D) 7.8 × 10 -46

Correct Answer

(D) 7.8 × 10 -46

[#45] 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

Correct Answer

(C) infrared and microwave