All forms of electromagnetic radiation, whether they're called waves or rays, are generated by particles in motion. In a radio signal ... that travel at the speed of light (300,000 kilometers ...

Ultrasound travels at the speed of sound which is 330 m/s in air. This is not fast enough to track fast moving aircraft or more distant objects. So, instead of using ultrasound, radio waves are ...

Electromagnetic radiation is the general term for the more familiar light and radio waves, but also includes gamma rays, x rays, ultraviolet rays, and infrared. All of these forms of electromagnetic ...

FAST is a useful way of remembering the speed and direction changes ... Diffraction affects radio and television signals. Long wave radio signals are much less affected by buildings, hills ...

Think about radio, and what often comes to mind ... Maxwell also boldly postulated that such waves travelled at the speed of light. In the late 1880s, German physicist Heinrich Hertz tested ...