If $E$ and $H$ represent the intensity of the electric field and the magnetising field respectively,then the unit of $E/H$ will be:

Electromagnetic waves consist of periodically oscillating electric and magnetic vectors:

$A$ charged particle oscillates about its mean equilibrium position with a frequency of $10^9 \; Hz$. What is the frequency of the electromagnetic waves produced by the oscillator?

$A$ point source of electromagnetic radiation has an average power output of $960 \,W$. The peak value of the electric field at a distance $400 \,cm$ from the source is (in $\,Vm^{-1}$)

The electric field intensity of an electromagnetic wave is ....... to the distance it has traveled.

The speed of an electromagnetic wave in a vacuum depends upon the source of radiation.