Atomic and Molecular Physics MCQs Question and Answer in Engineering Physics

All vibrations producing a change in the electric dipole moment of a molecule yield

A piece of paraffin is placed in a uniform magnetic field H₀. The sample contains hydrogen nuclei of mass m_p, which interact only with external magnetic field. An additional oscillating magnetic field is applied to observe resonance absorption. If g₁ is the g-factor of the hydrogen nucleus, the frequency at which resonance absorption takes place, is given by

Consider the following statements about molecular spectra:
P. CH₄ does not give pure rotational Raman lines
Q. SF₆ could be studied by rotational Raman spectroscopy
R. N₂ shows infrared absorption spectrum
S. CH₃CH₃ shows vibrational Raman and infrared absorption lines
T. H₂O₂ shows pure rotational spectrum
Choose the right combination of correct statements.

The hyperfine structure of Na(3²P_3/2) with nuclear $$l$$ = 3/2 has

The number of hyperfine components observed in the electronic transition $${}^2{p_{\frac{1}{2}}} \to {}^2{s_{\frac{1}{2}}}$$  of an atom with nuclear spin $$\frac{1}{2}$$ is

The spectral term for the atom with 70% filled subshell and only s = $$\frac{3}{2}$$ is

A system has energy level E₀, 2E₀, 3E₀, . . . . . , where the excited states are triply degenerated. Four non-interacting bosons are placed in this system. If the total energy of these bosons is 5E₀, the number of microstates is

The far infrared rotational absorption spectrum of a diatomic molecule shows equidistant lines with spacing 20 cm^-1. The position of the first stokes line in the rotational Raman spectrum of this molecule is

The three principal moments of inertia of a methanol (CH₃OH) molecule have the property $${I_x} = {I_y} = I$$   and $${I_z} \ne I.$$  The rotational energy eigenvalues are

The total number of Zeeman components observed in an electronic transition $${}^2{d_{\frac{5}{2}}} \to {}^2{p_{\frac{3}{2}}}$$  of an atom in a weak field is