Heinrich Hertz came to Karlsruhe in 1885 and used his time here to build on the work of the Scottish physicist James Maxwell. “Maxwell was the ingenious professor who was able to formulate the laws of ...

All forms of electromagnetic radiation, whether they're called waves or rays, are generated by particles in motion. In a radio signal, for example, negatively charged electrons quickly move back ...

He used an induction coil (not unlike Faraday’s) to create electromagnetic waves and a spark gap between two brass spheres to detect them. The spark was dim, lasting only a fraction of a second, but ...

Researchers at ETH Zurich have managed to make sound waves travel only in one direction. In the future, this method could ...

UP to the present date, short electromagnetic waves have been generated only by the method of the Hertz vibrator. This method offers very serious difficulties when we try to produce ...

In the following decade Heinrich Hertz generated and detected EM waves, which led ultimately to the generation, transmission and proliferation of radio waves. Cellphones, Bluetooth, Wi-Fi and ...

To detect electromagnetic waves Hertz used a simple form of oscillator which he called a 'resonator'. Cycles per second (cps) are now expressed as Hz, i.e. 800 Hz, rather than 800 cps.

Electromagnetic waves – eg light waves, microwaves, radio waves, x-rays. ... Ultrasound close ultrasound Sound with a frequency greater than 20,000 Hz (20 kHz). waves.