HCl

H2O

H2

OCS

Ia = Ib = Ic

Ia < Ib = Ic

Ia > Ib = Ic

$$Ia\ \ne Ib\ne Ic$$  

Spherical tops

Symmetric tops

Assymetric tops

Linear (hetero nuclear atoms)

$$I\ =\ \mu r^{ }$$  

$$I=mr^2$$  

$$I=ur^2$$  

$$I=Br^2$$  

radio frequency

microwave frequency

visible light

X-ray radiation

Interaction of electromagnetic radiation with rotating molecules

Transmission of radio waves through molecules

Reflection of light by molecules

Absorption of sound waves by molecules

It only affects the color of the molecules

It determines the speed of the rotating molecules

It has no significance in rotational spectroscopy

It determines the energy levels and transition frequencies of rotating molecules.

The rotational constant is equal to the moment of inertia.

The rotational constant is directly proportional to the moment of inertia.

The rotational constant is inversely proportional to the moment of inertia.

The rotational constant is not related to the moment of inertia.

The rigid rotor assumes a constant bond length and ignores the vibrational motion of the molecule, while the non-rigid rotor takes into account the variation in bond length and considers the vibrational motion.

The rigid rotor and non-rigid rotor are the same in rotational spectroscopy

The rigid rotor takes into account the variation in bond length and considers the vibrational motion, while the non-rigid rotor assumes a constant bond length

The rigid rotor considers the vibrational motion of the molecule, while the non-rigid rotor ignores the variation in bond length