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 ...

The structure was placed in a tank and the researchers directed sound waves between 7,000 and 12,000 Hz at it. Several receivers were set up to record the reflected waves. The waves reflected from ...

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 ...