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

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

A. Raman spectra

B. Infrared spectra

C. Ultra-violet spectra

D. X-ray spectra

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

A. $$\frac{{3{g_1}e{H_0}}}{{2\pi {m_p}}}$$

B. $$\frac{{3{g_1}e{H_0}}}{{4\pi {m_p}}}$$

C. $$\frac{{{g_1}e{H_0}}}{{2\pi {m_p}}}$$

D. $$\frac{{{g_1}e{H_0}}}{{4\pi {m_p}}}$$

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.

A. P and Q

B. P, R and T

C. P, S and T

D. Q and R

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

A. 1 state

B. 2 states

C. 3 states

D. 4 states