A plane sinusoidal electromagnetic wave has a magnetic field amplitude of 5 x 10^-5 T.
a) How much energy is contained in a volume of 1 x 10^-3 m^3 if the wave completely fills this volume?
b) What average force does this radiation exert on a totally reflecting surface of area 0.5 m^2, if the plane of the surface is perpendicular to the direction of propagation of the wave?