Test: Atomic & Molecular Physics - 2 - Physics MCQ

# Test: Atomic & Molecular Physics - 2 - Physics MCQ

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## 20 Questions MCQ Test GATE Physics Mock Test Series 2025 - Test: Atomic & Molecular Physics - 2

Test: Atomic & Molecular Physics - 2 for Physics 2024 is part of GATE Physics Mock Test Series 2025 preparation. The Test: Atomic & Molecular Physics - 2 questions and answers have been prepared according to the Physics exam syllabus.The Test: Atomic & Molecular Physics - 2 MCQs are made for Physics 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Atomic & Molecular Physics - 2 below.
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Test: Atomic & Molecular Physics - 2 - Question 1

### The rotational lines seperation in Raman experiment for HC1 molecule is 41.6 cm-1 The inter nuclear distance is________Å

Detailed Solution for Test: Atomic & Molecular Physics - 2 - Question 1

Rotational Raman line seperation is 4B = 41.6 cm-1
∴
Also,

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Test: Atomic & Molecular Physics - 2 - Question 2

### The rotational inertia for HI molecule is 4.5 x 10-48 kg m2. The temperature at which the average translational kinetic energy of molecule equals to difference of ground rotational static and First excited state is___________K.

Detailed Solution for Test: Atomic & Molecular Physics - 2 - Question 2

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Test: Atomic & Molecular Physics - 2 - Question 3

### Total number of vibrational degree of freedom of H2 O2 is__________________

Detailed Solution for Test: Atomic & Molecular Physics - 2 - Question 3

Vibrational degree of freedom is 3N – 6 = 3 x 4 - 6 = 6

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Test: Atomic & Molecular Physics - 2 - Question 4

The number of Zeeman lines of the spectrum line 3D→ 3P1  in presence of weak magnetic field is______________

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Test: Atomic & Molecular Physics - 2 - Question 5

For an atom in the state 2D5/2 the lande-g-factor should be__________

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Test: Atomic & Molecular Physics - 2 - Question 6

Let E1, E2, E3, be the first three energy levels of H-atom. Consider the ratio (E3—E1)/(E2-E1). Neglecting the fine structure condition, this ratio is approximately____________

Detailed Solution for Test: Atomic & Molecular Physics - 2 - Question 6

The energy levels of the hydrogen atom are given by the formula E = -13.6 eV/n^2, where n is the principal quantum number.

The first three energy levels correspond to n = 1, 2, and 3, respectively. Substituting these values into the formula gives us:

E1 = -13.6 eV E2 = -3.4 eV E3 = -1.5 eV

Plugging these values into the formula for the ratio gives us: (E3 - E1)/(E2 - E1) = (-1.5 - (-13.6))/(-3.4 - (-13.6)) = -12.1/-10.2 = 1.18

Therefore, the ratio (E3 - E1)/(E2 - E1) is approximately 1.18.

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Test: Atomic & Molecular Physics - 2 - Question 7

Two monochromatic sources, L1 and L2 emit light at 600 nm and 700 nm respectively. If their frequency band width are 10-1 and 10-3 GHz respectively, then ratio of line width L1 and Lis approximately___________

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Test: Atomic & Molecular Physics - 2 - Question 8

The figure (shown) depicts the energy levels of a 4 level atomic system with the Einstein A coefficients as follows

The life time of the atomic level 3 is

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Test: Atomic & Molecular Physics - 2 - Question 9

The Raman active mode for CO2, molecule is

Detailed Solution for Test: Atomic & Molecular Physics - 2 - Question 9

Symmetric streching mode lead to change in Polarisability and hence Raman active

Test: Atomic & Molecular Physics - 2 - Question 10

CO2 molecule lias the first tew energy levels uniformly seperatedby approximately 2.5 meV at a tempera tine of300 K. the ratio of the number of molecules in the 4th excited state to the number in 2nd excited state is about

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Test: Atomic & Molecular Physics - 2 - Question 11

The ground state terms for nd10, np4, np3 and nd8 are respectively in L-S coupling are

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Test: Atomic & Molecular Physics - 2 - Question 12

If the wavelength of the first line of Lyman series of hydrogen is 1215 Å. the wavelength of the second line of the series is

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Test: Atomic & Molecular Physics - 2 - Question 13

The Kβ line of X-ray emitted from an atom with principal quantum number n = 1, 2, 3,   arise from the transition.

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We Know

Test: Atomic & Molecular Physics - 2 - Question 14

If the line taken by an electron to traverse the first orbit in hydrogen atom is T. then the time taken by the electron to traverse the second orbit in lithium atom (Li++) is

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Test: Atomic & Molecular Physics - 2 - Question 15

If the atom is in the 3D3 state, the angle between it’s orbital and spin angular momentum vectors is

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On putting all these value, we get

Test: Atomic & Molecular Physics - 2 - Question 16

Which of the following transition are allowed

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Selection rule is

Test: Atomic & Molecular Physics - 2 - Question 17

Sodium atom ground state configuration is 1s2 2s2P6 3s1. by emitting 1e- Na changes to Na+ having configuration 1s2 2s2 2P6 in the transition the change in J value is

Detailed Solution for Test: Atomic & Molecular Physics - 2 - Question 17

Ground state term for sodium is  while the new state Nahas ground term
∴ Change in J value in this transition =

Test: Atomic & Molecular Physics - 2 - Question 18

According to the electric dipole transition, which is correct

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Test: Atomic & Molecular Physics - 2 - Question 19

Nuclear spin  for bismuth atom The number of levels in which the term  of bismuth will split up?

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Test: Atomic & Molecular Physics - 2 - Question 20

For pure rotatioal Raman spectrum of a linear diatomic molecule is recorded using Electromagnetic radiation of frequency v6. The frequency of the two consective stokes lines are

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