3543

Physics Electromagnetic Waves Level: University

The amplitude of the electric field component of an electromagnetic wave is increased from E to 4E. What is the corresponding change in the intensity of the wave?
(a) The intensity is unchanged by the increase in E
(b)The intensity increases by a factor of 16
(c) The intensity increases by a factor of 4
(d) The intensity decreases  by a factor of 4
(e) The intensity decreases  by a factor of 16