Determine the solution of the following question
Question- At a distance of 25m from an isotropic 100MHz radio source the intensity is 120W/m2.
Part 1- What is the Root mean square electric field at 25m?
Part 2- Over a 2 hour period, what is the momentum given to a 4cm by 4cm surface (at the 25m distance) perpendicular to the source the reflects 3/4 of the energy?
Part 3- What is the total power transmitted by the source?
I need experts help to calculate the Root mean square of electric field.