Pick out the longest wavelength from the following types of radiations.

If the energy of an electromagnetic wave is $14.4 \, keV$,which region of the electromagnetic spectrum does it belong to?

The correct ascending order of the wavelengths of the following electromagnetic waves is: Ultraviolet,$X$-rays,infrared,gamma rays,and visible light.

What is the use or importance of the ozone layer?

Arrange the following electromagnetic radiations per quantum in the order of increasing energy :-
$A$ : Blue light
$B$ : Yellow light
$C$ : $X$-ray
$D$ : Radiowave

The number of wavelengths in the visible spectrum is: