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

The energy of the electromagnetic waves is of the order of $15\, keV$. To which part of the spectrum does it belong?

Ozone is found in

If an electron oscillates at a frequency of $1 \, GHz$,it emits:

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:

$TV$ waves range from . . . . . .