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Microwaves
Beginning of essay
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 essay
...., a close kin of the microwave.
Infrared rays are what give you that warm glow when you put your
hand near a room radiator or a hotplate or a campfire. Infrared rays,
flowing from the sun and striking the atmosphere, make the Earth warm and
habitable. In a conventional gas or electric oven, infrared waves pour
off the hot elements or burners and are converted to heat when they strike
air inside and the food.
Microwaves and infrared rays are related in that both are forms of
electr.... |
| Number of words: 1380 |
Approximate pages: 6 |
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