Read through the course notes before watching the video. The course note files may also contain links to associated animations or interactive simulations.
Read sections 13.7 through 13.14:
Maxwell's Equations and Electromagnetic Waves (PDF - 1.1MB)
Read through the class slides. They explain all of the concepts from the module.
Watch the Problem Solving Help videos for insights on how to approach and solve problems related to the concepts in this module.
A light source at one frequency with a power output of 750 Watts radiates light of wavelength 500 nanometers uniformly in all directions. What are the maximum values of E and B for this light at a distance of 3 meters from the source.
A source of luminosity L exerts a radiation pressure on a cross sectional area dA at a distance R from the source. What is this radiation pressure assuming total absorption of the radiation? How is this related to the Poynting flux? If the light is totally reflected to instead of absorbed, how does this pressure change?
The Sun has a luminosity of 4 x 1026 Watts. The radius of the Sun is 7 x 108 meters. What is the mean Poynting vector at the surface of the Sun? What is the radiation pressure there for full absorption? What would the radiation pressure be at 1/2 the radius of the Sun?
The total power output of the Sun is 3.9 x 1026 Watts. How large a sail is necessary to propel a 5000 kilogram spacecraft against the gravitational force of the Sun? Using the same mathematics, compute the minimum radius of a grain of sand which can survive in the solar system.
The visualizations linked below are related to the concepts covered in this module.