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Chapter 21: Problem 3

A molecule can be excited to only the next higher rotational level by (a) absorption of energy (b) release of energy

Short Answer

Expert verified
(a) Absorption of energy can excite a molecule to the next higher rotational level. (b) Release of energy makes a molecule fall back to a lower rotational level.

Step by step solution

01

Understanding Molecular Excitation

Energy is required for excitation of a molecule from one rotational level to the next. As energy is absorbed by the molecule, the energy level increases, leading to the excitation of the molecule.
02

Analysing Molecular Energy Absorption

When a molecule absorbs energy, it rises to a higher rotational level. This absorbed energy corresponds with the difference between the original energy state and the excited state. Therefore, the molecule can only reach the next higher rotational level if it absorbs the precise amount of energy required.
03

Analysing Molecular Energy Release

When a molecule releases energy, it falls back to a lower rotational level. The released energy corresponds to the difference between the original high energy state and the lower energy state. This results in a drop in the rotation level of the molecule.

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Most popular questions from this chapter

The IR spectra of a compound helps in (a) providing the identify of compounds (b) showing the presence of certain functional group in the molecules (c) neither of the above (d) both of the above

In the Raman spectrum, the middle line is called (a) Raman line (b) Rayleigh line (c) functional group line (d) none of these

The electronic spectra consists of (a) a large number of absorption bands (b) a large number of closely packed lines (c) a large number of peaks (d) none of these

The electromagnetic radiation of higher wavelength has (a) higher (b) lower (c) intermediate (d) zero.

The change in frequency by scattering (Raman effect) occurs due to of energy between the incident photon and the scattering molecule. (a) release (b) absorption (c) exchange (d) none of these
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