The frequency order for $\gamma$-rays $(a)$,$X$-rays $(b)$,and $UV$-rays $(c)$ is given as:

What protects us from $UV$ light emitted by the Sun?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A:$ $EM$ waves used for optical communication have longer wavelengths than that of microwaves employed in $RADAR$ technology.
Reason $R:$ Infrared $EM$ waves are more energetic than microwaves (used in $RADAR$).
In the light of the given statements,choose the correct answer from the options given below:

Write the range of ultraviolet waves.

Which of the following radiations has the highest frequency?

What is the use or importance of the ozone layer?