Electromagnetic Waves - Physics PYQ

The magnetic field of a plane electromagnetic wave is given by \(B=(400 \propto \mathrm{T})\sin \left[\left(4.0 \times 10^{15} \mathrm{~s}^{-1}\right)\left(t-\frac{x}{c}\right)\right]\). Average energy density corresponding to the electric field is

In an amplitude modulated signal, the maximum amplitude is \(15 \mathrm{~V}\) and minimum amplitude is \(5 \mathrm{~V}\). The amplitude of modulating wave will be

The electric and the magnetic fields associated with an electromagnetic wave propagating along the \(z\)-axis, can be represented by

A carrier wave is used to transmit a message signal. If the peak voltage of modulating signal and carrier signal are increased by \(1 \%\) and \(3 \%\) respectively, the modulation index is changed by

The electric field \((E)\) and magnetic field \((B)\) of an electromagnetic wave passing through vacuum are given by

$$\begin{aligned} & E=E_0 \sin (k x-\omega t) \\ & B=B_0 \sin (k x-\omega t) \end{aligned}$$

Then the correct statement among the following is

A light of intensity \(12 \mathrm{Wm}^{-2}\) incidents on a black surface of area \(4 \mathrm{~cm}^2\). The radiation pressure on the surface is

The maximum number of TV signals, that can be transmitted along a co-axial cable is

A beam of light with intensity \(10^{-3} \mathrm{~Nm}^{-2}\) and cross-sectional area \(20 \mathrm{~cm}^2\) is incident on a fully reflective surface at angle \(45^{\circ}\). Then, the force exerted by the beam on the surface is

If the average power per unit area delivered by an electromagnetic wave is \(9240 \mathrm{~Wm}^{-2}\). then the amplitude of the oscillating magnetic field in EM wave is

A plane electromagnetic wave travels in free space along \(Z\)-axis. At a particular point in space, the electric field along \(X\)-axis is \(8.7 \mathrm{~Vm}^{-1}\). The magnetic field along \(Y\)-axis is

The magnetic field in a plane electromagnetic wave is given as \(\mathbf{B}=\left(3 \times 10^{-7} \mathrm{~T}\right) \sin \left(3 \times 10^4 x+9 \times 10^{12} t\right) \hat{j}\)

The electric field of this wave is given as

Frequencies in the UHF range normally propagate by means of