Electromagnetic...

A plane electromagnetic wave in a non magnetic dielectric medium is given by $$\bar{E} = \bar{E_0} ( 4 \times 10^{-7}x - 50 t)$$ with distance being in meter and time in seconds. The dielectric constant of the medium is:

The mathematical equation for magnetic field lines of force is 

The magnetic field in a plane EM wave is given by - $$\mathrm { B } = ( 100 \mu \mathrm { T } ) \sin \left[ \left( 2 \times 10 ^ { 15 } \mathrm { S } ^ { - 1 } \right) ( \mathrm { t } - \mathrm { x } / \mathrm { c } ) \right] \hat { \mathrm { j } }$$
The equation for electric field is

The Maxwell's equation : $$\oint \vec { \mathrm { B } }$$ . $$\vec { \mathrm { d } l } = \mu _ { 0 } \left( \mathrm { i } + \varepsilon _ { 0 } \cdot \frac { \mathrm { d } \phi _ { \mathrm { E } } } { \mathrm { dt } } \right)$$ is a statement of

On photo-emissive cell, with exciting wavelength I, the fastest electron has speed u. If the exciting wavelength is changed to 3I/4, the speed of the fastest emitted electron will be:

An electro magnetic wave of frequency 3 MHz passes from Vacuum into a dielectric medium with permittivity $$ \epsilon  = 4.0 $$ Then 

In an electromagnetic wave in vacuum. The electrical and magnetic fields are $$40 \pi\ V/m$$ and $$0.4\times 10^{-7}T$$. The pointing vector 

Wavelength of light in different media are proportional to:

Which of the following electromagnetic waves have minimum frequency 

In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of $$2 \times 10 ^ { 10 } \mathrm { Hz }$$ and amplitude 48V/m. The amplitude of oscillating magnetic field will be