The total energy carried by the light wave when it travels from a rarer to a non-reflecting and nonabsorbing medium

Electromagnetic waves are incident normally on a perfectly reflecting surface having surface area $A$. If $I$ is the intensity of the incident electromagnetic radiation and $c$ is the speed of light in vacuum, the force exerted by the electromagnetic wave on the reflecting surface is

The ratio of the magnitudes of electric field to the magnetic field of an electromagnetic wave is of the order of

Which of the following radiations of electromagnetic waves has the highest wavelength ?