Electromagnetic...

If the magnetic field of a plane electromagnetic wave is given by (The speed of light $$= 3\times 10^{8}/ m/s) B = 100\times 10^{-6} \sin \left [2\pi \times 2\times 10^{15} \left (t - \dfrac {x}{c}\right )\right ]$$ then the maximum electric field associated with it is

A gas of identical hydrogen like atoms has some atoms in ground state and some atoms in a particular excited state and there are no atoms in any other energy level. The atoms of the gas make transition to a higher state by absorbing monochromatic light of wavelength $$304 \mathring A $$. subsequently, the atoms emit radiation of only six different photon energies. Some of emitted photons have wavelength $$304 \mathring A $$, some have wavelength more and some have less than $$304 \mathring A $$ ( Take $$hc = 12420 eV - \mathring A $$). Find the principal quantum number of the initially excited state.

A gas of identical hydrogen like atoms has some atoms in ground state and some atoms in a particular excited state and there are no atoms in any other energy level. The atoms of the gas make transition to a higher state by absorbing monochromatic light of wavelength $$304 \mathring A $$. subsequently, the atoms emit radiation of only six different photon energies. Some of emitted photons have wavelength $$304 \mathring A $$, some have wavelength more and some have less than $$304 \mathring A $$ ( Take $$hc = 12420 eV - \mathring A $$). Find the principal quantum number of the initially excited state.

An EM wave radiates outwars from a dipole antenna, with $$
E_{0}
 $$ as the amplitude of its electric field vector. The electric field $$
E_{0}
 $$ which transports significant energy from the source falls off as

The displacement current is given by the expression

Which of the following relation is correct

Displacement current flows

Direction of propagation of wave means :

A plane electromagnetic wave propagation in the x-direction has a wavelength of $$5.0$$ mm. The electric field is in the y-direction and its maximum magnitude is $$30V/m$$. Find equation for the electric field as a field as a function of x and t.

A gas of identical hydrogen like atoms has some atoms in ground state and some atoms in a particular excited state and there are no atoms in any other energy level. The atoms of the gas make transition to a higher state by absorbing monochromatic light of wavelength $$304 \mathring A $$. subsequently, the atoms emit radiation of only six different photon energies. Some of emitted photons have wavelength $$304 \mathring A $$, some have wavelength more and some have less than $$304 \mathring A $$ ( Take $$hc = 12420 eV - \mathring A $$)
Find the principal quantum number of the initially excited state.