$A$ 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?

The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is $B_0 = 510 \; nT$. What is the amplitude of the electric field (in $N/C$) part of the wave?

What is the range of frequency of $EM$ waves that are reflected back by the ionosphere?

The electric fields of two plane electromagnetic waves in vacuum are given by $\overrightarrow{E}_{1}=E_{0} \hat{j} \cos (\omega t-kx)$ and $\overrightarrow{E}_{2}=E_{0} \hat{k} \cos (\omega t-ky)$. At $t=0$,a particle of charge $q$ is at the origin with a velocity $\overrightarrow{v}=0.8 c \hat{j}$ ($c$ is the speed of light in vacuum). The instantaneous force experienced by the particle is:

The speed of electromagnetic waves is the same for .......

The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is: