Electromagnetic waves practice · Mixed difficulty

If an electromagnetic wave is propagation in a medium with permeability $\mathrm{\varepsilon }$ and permittivity $\mathrm{\mu }$, then $\sqrt {\frac{\mathrm{\mu }}{\mathrm{\varepsilon }}}$ is the

A capacitor having a capacity of 2 pF. Electric field across the capacitor is changing with a value of ${10^{12}}\mathrm{\;V}{\mathrm{s}^{ - 1}}$. The displacement current is

The existence of electromagnetic waves was theoretically predicted by

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

The frequency $1057 \mathrm{~MHz}$ of radiation arising from two close energy levels in hydrogen belongs to

A charged particle enters a uniform magnetic field with a velocity vector at an angle of $45^\circ$ with the magnetic field. The pitch of the helical path followed by the particle is p. The radius of the helix will be

The dielectric constant of air is 1.006. The speed of electromagnetic wave travelling in air is $a \times {10^8}\;m{s^{ - 1}}$, where a is about

An electromagnetic wave can be produced, when charge 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 ( $\mathrm{c}=$ speed of light)

A charged particle moving with constant acceleration produces