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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 their i ....
Middle of essay
.... 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.
and infrared rays are related in that both are forms of electromagnetic energy. Both consist of electric and magnetic fields that rise .... |
| Number of words: 1376 |
Approximate pages: 6 |
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