The magnetic field in a sinusoidal light wave has an amplitude of 3.3 *10^-⁷T. The intensity of the wave is: A) 1.7* 10^-⁴ W/m² B) 13 W/m² C) 27 W/m² D) 1.0 *10⁵ W/m² E) 4.0 * 10¹⁰ W/m²

Question

Quizplus · Accepted Answer

The intensity of an electromagnetic wave is given by I = (cB^2)/(2μ₀), where c is the speed of light and μ₀ is the permeability of free space. Substituting the given magnetic field amplitude into this formula yields an intensity of approximately 13 W/m².

The Magnetic Field in a Sinusoidal Light Wave Has an Amplitude