The magnetic field of an electromagnetic wave has a peak value of 5.0 × 10^-10 T. What is the intensity of the wave? A)1.0 × 10^-13 W/m² B)1.5 × 10^-5 W/m² C)3.0 × 10^-5 W/m² D)2.0 × 10^-13 W/m² E)7.5 × 10⁵ W/m²

Question

Quizplus · Accepted Answer

The intensity of an electromagnetic wave is given by I = (cε₀/2)E², where E = cB. Substituting B = 5.0 × 10⁻¹⁰ T and c = 3 × 10⁸ m/s, we find I = 3.0 × 10⁻⁵ W/m².

The Magnetic Field of an Electromagnetic Wave Has a Peak