Atomic And Molecular Physics - Study Mode
[#46] The target of an X-ray tube is subjected to an excitation voltage V. The wavelength of the emitted X-rays is proportional to
Correct Answer
(C) $$frac{1}{V}$$
[#47] In a two-electron atomic system having orbital and spin angular momenta $${l_1}{l_2}$$ xa0and $${s_1}{s_2}$$ xa0respectively, the coupling strengths are defined as $${Gamma _{{l_1}{l_2}}},,{Gamma _{{s_1}{s_2}}},,{Gamma _{{l_1}{s_1}}},,{Gamma _{{l_2}{s_2}}},,{Gamma _{{l_1}{l_2}}}$$ xa0 xa0 xa0and $${Gamma _{{l_2}{s_1}}}.$$ xa0For the jj coupling. scheme to be applicable, the coupling strengths must satisfy the condition
Correct Answer
(B) $${Gamma _{{l_1}{s_1}}},,{Gamma _{{l_2}{s_2}}} > {Gamma _{{l_1}{l_2}}},,{Gamma _{{s_1}{s_2}}}$$
[#48] If an atom is in the 3 d 3 state, the angle between its orbital and spin angular momentum vectors ($$overrightarrow {x08f{L}} $$ and $$overrightarrow {x08f{S}} $$) is
Correct Answer
(A) $${cos ^{ - 1}}frac{1}{{sqrt 3 }}$$
[#49] Which one of the following statements is incorrect in vibrational spectroscopy with anharmonicity?
Correct Answer
(C) The intensities of hot band lines are stronger than the fundamental absorption
[#50] The pure rotational level of a molecule in the far-infrared region follows the formula F(J) = BJ(J + 1), where F(J) is the energy of the rotational level with quantum number J and B is the rotational constant. The lowest rotational energy gap in rotational Raman spectrum is
Correct Answer
(B) 4B