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

Vedclass · Accepted Answer

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

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(A) $1$. 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 (Lamb shift)	$D$. $X$-rays

$i$. Microwave	$(a)$. $700 \ nm$ to $400 \ nm$
$ii$. Visible light	$(b)$. $1 \ nm$ to $10^{-3} \ nm$
$iii$. Ultraviolet	$(c)$. $0.1 \ m$ to $1 \ mm$
$iv$. $X$-rays	$(d)$. $400 \ nm$ to $1 \ nm$

List-$I$	List-$II$
$A.$ Radio-wave	$I.$ Produced by Magnetron valve
$B.$ Micro-wave	$II.$ Due to change in the vibrational modes of atoms
$C.$ Infrared-wave	$III.$ Due to inner shell electrons moving from higher energy level to lower energy level
$D.$ $X$-ray	$IV.$ Due to rapid acceleration of electrons

Similar Questions

Match the following types of waves with their wavelength ranges:
$i$. Microwave $(a)$. $700 \ nm$ to $400 \ nm$
$ii$. Visible light $(b)$. $1 \ nm$ to $10^{-3} \ nm$
$iii$. Ultraviolet $(c)$. $0.1 \ m$ to $1 \ mm$
$iv$. $X$-rays $(d)$. $400 \ nm$ to $1 \ nm$

Which of the following colours of visible light has the lowest energy?

Write the range of frequencies for radio waves and $FM$ band radio.

If $\lambda_r$,$\lambda_v$,and $\lambda_x$ are the wavelengths of red light,violet light,and $X$-rays respectively,then which of the following relations is correct?

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