The UV-visible absorption bands in the spectra of lanthanoid ions are ‘X’, probably because of the excitation of electrons involving ‘Y’. The ‘X’ and ‘Y’, respectively, are :

Question

Electromagnetic wave with intensity \( I = 4 \times 10^{14} \, \text{watt/m}^2 \) is propagating in free space. Find the amplitude of magnetic field \( B_0 \). Given: \( c = 3 \times 10^8 \, \text{m/s}, \epsilon_0 = 8.85 \times 10^{-12} \, \text{C}^2/\text{N} \cdot \text{m}^2 \).

Answer 1

Lanthanides exhibit narrow absorption bands in the UV-visible spectrum. This phenomenon occurs because the outer electrons effectively shield the f orbitals. Consequently, electronic transitions within the \(f\) orbitals are minimally influenced by external factors such as ligands or other ions. This shielding results in the characteristic narrow and distinct absorption bands, which arise from transitions involving \(f\) orbitals.

List I	List II
A. The Evil Quartet	III. Causes of biodiversity losses
B. Ex situ conservation	I. Cryopreservation
C. Lantana camara	II. Alien species invasion
D. Dodo	IV. Extinction

The UV-visible absorption bands in the spectra of lanthanoid ions are ‘X’, probably because of the excitation of electrons involving ‘Y’. The ‘X’ and ‘Y’, respectively, are :

The Correct Option is B

Solution and Explanation

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