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

The ratio of the electric field $(E)$ to the magnetic field $(B)$ in an electromagnetic wave gives which physical quantity?

The velocity of electromagnetic waves is parallel to which of the following?

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

$A$ sky wave with a frequency of $55 \text{ MHz}$ is incident on the $D$-region of the ionosphere at an angle of $45^\circ$. What is the angle of refraction? (The electron density in the $D$-region is $400 \text{ electrons/cm}^3$).

The electric and the magnetic field,associated with an electromagnetic wave propagating along the $+z$-axis,can be represented by