QUESTIONS

A radio station broadcasts at $30 \mathrm{m}$. Find the frequency of broadcast.    

How long would gamma radiation take to travel from sun to earth, a distance of $1.5\times {10}^{11}$ m?

A plane electromagnetic wave has a maximum electric field of $3.20\times {10}^{-4}{\mathrm{Vm}}^{-1}$. What is maximum magnetic field?

In a plane EM wave, the magnetic field oscillates sinusoidally with a frequency of $2.0\times {10}^{10}$  $\mathrm{Hz}$ and an amplitude of $46$$\mathrm{Wb} {\mathrm{m}}^{-2}$.  Find the wavelength of the wave and the amplitude of the oscillating electric field.

In a plane EM wave, the electric field oscillates sinusoidally with a frequency of $2\times {10}^{10}$ $\mathrm{Hz}$ and an amplitude of $48 \mathrm{V} {\mathrm{m}}^{-1}$. Find the wavelength and the amplitude of the oscillating magnetic field.

A laser beam has intensity $2.5\times {10}^{14} \mathrm{W} {\mathrm{m}}^{-2}$. Find the amplitudes of electric and magnetic fields in the beam.

In a plane electromagnetic wave, the amplitude of the magnetic field is $5.0\times {10}^{-6}$  T. Find the amplitude of the electric field and the total average energy density of the wave. 

In a plane electromagnetic wave the electric field varies with time having an amplitude of $1.0{\mathrm{Vm}}^{-1}$. Find the average energy density of magnetic field and that of electric field.