To which region of the electromagnetic spectrum does the frequency $1\, GHz$ correspond?

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

Which of the following represents an infrared wavelength?

Match List-$I$ with List-$II$:

List-$I$ ($EM$ Wave)	List-$II$ (Wavelength Range)
$(A)$ Infrared	$(i)$ $ < 10^{-3} \, nm$
$(B)$ Ultraviolet	$(ii)$ $400 \, nm$ to $1 \, nm$
$(C)$ $X$-rays	$(iii)$ $1 \, mm$ to $700 \, nm$
$(D)$ Gamma rays	$(iv)$ $1 \, nm$ to $10^{-3} \, nm$

Choose the correct answer from the options given below:

Write the range of wavelength of $X$-rays.

The energy of a gamma $(\gamma)$ ray photon is $E_{\gamma}$,and that of an $X$-ray photon is $E_{X}$. If the visible light photon has an energy of $E_{v}$,then we can say that: