electromagnetic waves

• What Are the Applications of the Wave Equation?
  The wave equation models how disturbances travel. Explore its uses in strings, sound, light, water, and seismic waves, with a worked string example.
• What Is the Relationship Between Light Intensity and Wavelength?
  Light intensity is not set by wavelength alone: at fixed wave amplitude it is independent, while at fixed photon flux it scales as 1/λ.