The direction of propagation is the direction of E B . Electromagnetic waves are transverse waves . The speed of any sinusoidal wave is the product of its wavelength and frequency. When electromagnetic waves travel through a medium. For air n is nearly equal to 1.
Visible light makes up just a small part of the full electromagnetic spectrum.
Electromagnetic waves with shorter wavelengths and higher frequencies include ultraviolet light, X-rays, and gamma rays. Electromagnetic waves with longer wavelengths and lower frequencies include infrared light, microwaves, and radio and television waves. Electromagnetic waves transport energy through space . The magnitude of the energy flux S is the amount of energy that crosses a unit area perpendicular to the direction of propagation of the wave per unit time. The Poynting vector is the energy flux vector.