All light has both particle-like and wave-like properties. Photons carry momentum, have no mass, and travel at the speed of light. Light is made of discrete packets of energy called photons. First, he had demonstrated in the concrete, what Maxwell had only theorized - that the velocity of radio waves was equal to the velocity of light! This proved that radio waves were a form of light! Second, Hertz found out how to make the electric and magnetic fields detach themselves from wires and go free as Maxwell's waves - electromagnetic waves. His experiment with radio waves solved two problems. The unit of frequency of a radio wave - one cycle per second - is named the hertz, in honor of Heinrich Hertz. Heinrich Hertz, a German physicist, applied Maxwell's theories to the production and reception of radio waves. He summarized this relationship between electricity and magnetism into what are now referred to as "Maxwell's Equations."
He noticed that electrical fields and magnetic fields can couple together to form electromagnetic waves. In the 1860's and 1870's, a Scottish scientist named James Clerk Maxwell developed a scientific theory to explain electromagnetic waves. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space. Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. These changing fields form electromagnetic waves. A changing magnetic field will induce a changing electric field and vice-versa-the two are linked. Magnetism can also be static, as it is in a refrigerator magnet. Credit: Ginger Butcher ELECTROMAGNETIC WAVESĮlectricity can be static, like the energy that can make your hair stand on end.
When a balloon is rubbed against a head of hair, astatic electric charge is created causing their individual hairs to repel one another.
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