Microwaves
Beginning of paper
You might remember the heroic role that newly-invented radar
played in the Second World War. People hailed it then as "Our Miracle
Ally".
But even in its earliest years, as it was helping win the war, radar
proved to be more than an expert enemy locator. Radar technicians,
doodling away in the ....
Middle of paper
.... wavelength, could be
focussed ina narrow beam with an antenna many times smaller. This enabled
them to make more effective use of radar since an antenna could be carried
on aircraft, ships and mobile ground stations.
This characteristic of microwaves, the efficiency with which they are
concentrated in a narrow beam, is one reason why they can be used in
cooking. You can produce a high-powered microwave beam in a small oven,
but you can't do the same with radio waves, which are simply too ....
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Word count: 1380
Page count: 6 (approximately 250 words per page)
