An electromagnatic wave is traveling in vacuum with frequency 5.7 x 1014 Hz. The wave has average total energy density of 4.6 x 10-6 J/m3. (e) How much energy does a 1.9 m2 flat surface (perpendicular to the wave propagation direction) receive in 9 s? E = 23598 J, how do i get that number? 4.6*10^-6 = ATC??