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(B) $1$. The sodium doublet ($D$-lines) has wavelengths of approximately $589.0 \; nm$ and $589.6 \; nm$,which falls in the visible spectrum. Thus,$I-

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$I-A, II-B, III-B, IV-C$

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(B) $1$. The sodium doublet ($D$-lines) has wavelengths of approximately $589.0 \; nm$ and $589.6 \; nm$,which falls in the visible spectrum. Thus,$I-A$.$2$. The isotropic radiation filling all space (Cosmic Microwave Background Radiation) corresponds to a temperature of about $2.7 \; K$,which peaks in the microwave region. Thus,$II-B$.$3$. The $21 \; cm$ line radiation emitted by atomic hydrogen in interstellar space is a radio wave. Thus,$III-C$.$4$. The radiation arising from the Lamb shift (two close energy levels in hydrogen) corresponds to a wavelength of approximately $30 \; cm$,which is in the microwave region. Thus,$IV-B$.Therefore,the correct matching is $I-A, II-B, III-C, IV-B$.

List-$I$	List-$II$
$I$. Doublet of sodium	$A$. Visible radiation
$II$. Wavelength corresponding to temperature associated with the isotropic radiation filling all space	$B$. Microwave
$III$. Wavelength emitted by atomic hydrogen in interstellar space	$C$. Short radio wave
$IV$. Wavelength of radiation arising from two close energy levels in hydrogen	$D$. $X$-rays

List-$I$	List-$II$
$(a)$ Ultraviolet rays	$(i)$ Study crystal structure
$(b)$ Microwaves	$(ii)$ Greenhouse effect
$(c)$ Infrared waves	$(iii)$ Sterilizing surgical instruments
$(d)$ $X$-rays	$(iv)$ Radar system

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