1940s radar relied on a semiconductor crystal, or "rectifier." Radar worked by sending out a radio wave and analyzing the reflected wave after it bounced off any objects in the air. The rectifier ...

Water waves can reflect or ‘bounce off’ a surface. For example, ocean waves are reflected when they hit a harbour wall, just like light waves reflect when they hit a mirror and waves in ...

Describe how waves are formed on the beach after watching the animation. Practice drawing reflected and refracted waves at different angles after watching the animation. Choose different mediums ...