it is the transmission of microwaves. One person throws a microwave to another person and so on.
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Pneumatic systems use air or a gas which is compressible. When compressed, water can form in pneumatics.Hydraulic systems use oil or a transmission fluid, which is comparatively uncompressible, meaning more efficient power transmission and higher operating pressures.
to produce freq in the range of ghz tat is microwave freq range
According to a document from the Sharp Corporation (refer to the link below; n.b., it is a huge PDF document!): "1966 R-600 Turntable Microwave Oven Sharp developed the world's first microwave oven to use a turntable, introducing it as Japan's first consumer model."
Pneumatic systems use air or an inert gas. Hydraulic systems use water or oil.
No. Radar use electromagnetic radiation of a much longer wavelength