The matter-wave picture of electromagnetic wave/radiation elegantly incorporated the:

If $c$ is the speed, $\nu$ is frequency and $\displaystyle \lambda $ is wavelength of EM waves, then

The broad wavelength range of visible spectrum is:

Identify which of the following light rays has the highest energy?

The portion of the spectrum beyond the red end is called

Wavelength of gamma rays are :

Electromagnetic wave with frequencies greater than the critical frequency of ionosphere cannot be used for communication using sky wave propagation because

Which is having minimum wavelength ?

If $P$ represents radiation pressure, $c$ represents speed of lights and $l$ represents radiation energy striking a unit area per second, then non -zero integers $x,y$ and $z$ such that $P^ xl^ yc^z$ is dimensionless are

An electromagnetic radiation has an energy 14.4 eV. To which region of electromagnetic spectrum does it belong?

Electromagnetic wave of intensity $1400\ W/m^{2}$ falls on metal surface on area $1.5\ m^{2}$ is completely absorbed by it. Find out force exerted by beam.

Which one of the following is the primary effect of UV radiation caused due to depletion of ozone layer?

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 \AA $. subsequently, the atoms emit radiation of only six different photon energies. Some of emitted photons have wavelength $304 \AA $, some have wavelength more and some have less than $304 \AA $ ( Take $hc = 12420 eV - \AA $)
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.

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.

Mark the correct option in impure spectrum :

Radiations of intensity 0.5 W/m2 are striking a metal plate. The pressure on the plate is

Radiation pressure on any surface :