If $\lambda = 10 \mathring A$,then it corresponds to

Match the List-$I$ with List-$II$. Choose the correct answer from the options given below:

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

Which of the following has the minimum frequency?

The wavelengths of Gamma rays,$X$-rays,and microwaves are respectively $\lambda_r, \lambda_x$,and $\lambda_m$. Then which of the following relations is correct?

Match the List-$I$ (Phenomenon associated with electromagnetic radiation) with List-$II$ (Part of electromagnetic spectrum) and select the correct code from the choices given below:

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

Write a short note on light.