Embibe Experts Solutions for Exercise 4: Assignment

If the electric field and magnetic field of an electromagnetic wave are related as $B=\frac{E}{c},$ where the symbols have their usual meanings and the energy in a given volume of space due to the electric field part is $U,$ then the energy due to the magnetic field part will be

Which of the following physical quantities contained in a small volume oscillates at double the frequency of passing electromagnetic waves?

A plane electromagnetic wave of frequency $28\mathrm{MHz}$ travels in free space along the positive $x-$direction. At a particular point in space and time, electric field is $9.3 \mathrm{V} {\mathrm{m}}^{-1}$ along positive $y-$direction. The magnetic field (in $\mathrm{T}$) at that point is

A plane electromagnetic wave is incident on a plane surface of area $A$ normally, and is perfectly reflected. If energy $E$ strikes the surface in time $t$ then average pressure exerted on the surface is ($c=$ speed of light)

For a medium with permittivity $\epsilon$ and permeability $\mu$ the velocity of light is given by

Which one of the following electromagnetic radiations has the smallest wavelength?

If ${\mathrm{\epsilon }}_0 \mathrm{and} {\mathrm{\mu }}_{\mathrm{o}}$ are the electric permittivity and magnetic permeability and the free space and $\mathrm{\epsilon } \mathrm{and} \mathrm{\mu }$ are the corresponding quantities in a medium, then the index of refraction of the medium is

What is the cause of greenhouse effect ?