A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At a distance of 6.50 km from the source, a detector measures the intensity of the wave to be 32.0 µW/m2. What is the peak value of the magnetic field at the detector due to the wave?
The detector is replaced with a perfectly absorbing sheet normal to the incident flux, with surface area 2.00 m2. What is the force on the sheet due to the wave? (You have an expression for radiation pressure when the wave is totally absorbed. Pressure is force per unit area.)