One requires 11 eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in

A linearly polarised electromagnetic wave given as $\mathbf{E}=\mathrm{E}_0 \hat{\mathbf{i}} \cos (k z-\omega t)$ is incident normally on a perfectly reflecting infinite wall at $z=a$. Assuming that the material of the wall is optically inactive, the reflected wave will be given as

Light with an energy flux of $20 \mathrm{~W} / \mathrm{cm}^2$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $30 \mathrm{~cm}^2$, the total momentum delivered (for complete absorption) during 30 min is

The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is $E$. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is

If $\mathbf{E}$ and $\mathbf{B}$ represent electric and magnetic field vectors of the electromagnetic wave, the direction of propagation of electromagnetic wave is along