![]() The radio "receives" these electromagnetic radio waves and converts them to mechanical vibrations in the speaker to create the sound waves you can hear. ![]() You can tune a radio to a specific wavelength-or frequency-and listen to your favorite music. Hertz showed in his experiments that these signals possessed all the properties of electromagnetic waves. When waves created by the sparks of the coil transmitter were picked up by the receiving antenna, sparks would jump its gap as well. He used a spark gap attached to an induction coil and a separate spark gap on a receiving antenna. ![]() Heinrich Hertz proved the existence of radio waves in the late 1880s. They range from the length of a football to larger than our planet. Radio waves have the longest wavelengths in the electromagnetic spectrum. In 1932, Karl Jansky at Bell Labs revealed that stars and other objects in space radiated radio waves.
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