The discussion centers on the relationship between energy density in electromagnetic (EM) waves and the amplitude of the electric field. It is established that the energy density U of an EM wave is given by the equation U = (E² + B²)/2, where E is the electric field and B is the magnetic field. The average value of E² is proportional to the square of the maximum electric field (Emax²), indicating that the average energy density does not depend on the frequency (ω) of the wave. This is clarified by the distinction between average values and instantaneous values, emphasizing that while Emax may vary with ω, the average energy density remains constant. The discussion also touches on the relationship between electric field strength, charge acceleration, and how these factors influence the amplitude of the electric field, leading to questions about the dependency of average energy density on frequency.
