泉州市2014高考英语文章突破一轮训练(22)及答案
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Microwaves may be great at warming up food,but what
about warming people?
Using microwaves to directly heat owners of a room would save much of the energy wasted by heating walls and furniture.And despite popular ideas about microwaves,this technique would be safe,according to Charles R.Burlier of the Microwave Research Center in Marlborough,New Hampshire.Lowpower microwaves only penetrate (贯穿)the skin (lowpower microwave penetration in a ham is about 0.2 inches,for example)and with no negative effects.
To test this idea,Buffler subjected himself to microwaves in a special room using a standard 500watt,2,459 MHz magnetron (磁控管).He found that a person will start to feel warmth at about 20 milliwatts per square centimeter (mw./ sq.cm.);a satisfactory feeling of warmth occurs between 35 and 50mw./ sq.cm.By comparison,a person standing in noonday summer sun feels the amount of 85 mw./ sq.cm.And a frozen meat pie in your microwave oven receives about 1,000 mw./ sq.cm.
In houses of the future,each room could be provided with its own magnetron,says Buffler.When you stepped into the living room,for example,a motion detector (运动感应器)would turn on the magnetron,filling the room with lowpower microwaves.In the same way that a microwave oven heats up a hamburger,but not the plate it's on,you would feel warmth from the microwaves without changing the temperature of your coffee table.You could,however,make your favorite easy chair even more comfortable by treating it with a radiation-absorbing chemical.
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