The first steps toward inventing radio involved discovering electromagnetic waves and their potential. Hans Christian Oersted was the first to proclaim, in 1820, that a magnetic field is created ...

Late in the nineteenth century, Guglielmo Marconi began experimenting with electromagnetic waves to send signals ... it was an epoch in history. I now felt for the first time absolutely certain ...

Electromagnetic waves are members of a family of waves with common properties called the electromagnetic spectrum. The electromagnetic spectrum is a continuous range of wavelengths. The types of ...

Explores the evolution of human understanding and utilization of energy, particularly through the lens of the radiant energy spectrum. It traces the journey from primitive man's quest for survival to ...