These properties make them ideal for communications. Information is coded into the wave before transmission, which can then be decoded when the wave is received. Television and radio systems use ...

Why is it so weak? Back in the 1930s, as physicists were just devising the quantum theory of the much more muscular electromagnetic force, they came up with an explanation. The photon, the quantum ...

Electromagnetic waves travel at 300,000,000 metres per second (m/s) through a vacuum. Electromagnetic waves can be separated into seven distinct groups in the spectrum. Each group contains a range ...