K K Sharma Solutions for Chapter: Electromagnetic Waves, Exercise 22: Energy Density and Intensity

In an electromagnetic wave, the average energy density associated with the electric field will be?

The RMS value of the electric field of light coming from the sun is $720 \mathrm{N}/\mathrm{C}$. The total average energy density of the electromagnetic wave is

During the propagation of electromagnetic waves in a medium

A plane electromagnetic wave of wave intensity $6 \mathrm{W} {\mathrm{m}}^{-2}$ strikes a small mirror of area $40 {\mathrm{cm}}^2$ and is held perpendicular to the approaching wave. The momentum transferred by the wave to the mirror each second will be

The intensity of light from a source is $\frac{500}{\mathrm{\pi }} \mathrm{W} {\mathrm{m}}^{-2}$. The amplitude of electric field in this wave is

A point source of $2 \text{W}$ is radiating uniformly in all directions in a vacuum. The amplitude of electric field at a distance $2 \mathrm{m}$ from it is

An electromagnetic wave propagating along the $z$ axis has a frequency of $5\times {10}^4 \mathrm{Hz}$. If the amplitude of the electric field is $10 \mathrm{V} {\mathrm{m}}^{-1}$, then the average energy density of the magnetic field is

A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum $p$ and energy $E$, then