Unformatted text preview: were used to bounce their microwave signal off Nazi bombers. Radar grew more sophisticated and able to detect airplanes, to scan the horizon for enemy ships and to paint finely detailed electronic pictures. High-Speed cooking has been discovered 35 years ago and invented by M.I.T and British scientists. Today, people can use it to cook food and to perform difficult heating or drying jobs. Last, microwaves can pass undistorted through the air- makes them good messengers to carry telephone conversations as well as live television signals....
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- Spring '11
- Electromagnetic spectrum, Wentian Su