When $\mu_r$ and $\epsilon_r$ are the relative permeability and relative permittivity (dielectric constant) respectively,the refractive index is given by:

Show that the average value of radiant flux density $S$ over a single period $T$ is given by $S = \frac{1}{2c\mu_0}E_0^2$.

What is the wavelength of light with a frequency of $100\;Hz$?

Given below are two statements:
Statement $I$: Electromagnetic waves carry energy as they travel through space and this energy is equally shared by the electric and magnetic fields.
Statement $II$: When electromagnetic waves strike a surface,a pressure is exerted on the surface.
In the light of the above statements,choose the most appropriate answer from the options given below:

If $\vec{E}$ and $\vec{B}$ are the electric and magnetic field vectors of an electromagnetic wave,then the direction of propagation of the electromagnetic wave is

The peak value of the magnetic field of an electromagnetic wave moving in a magnetic field is $20 \, nT$. The peak value of the electric field intensity is ..... $V/m$.