Rand and Fisher found that under the right circumstances and in right types of materials, the lights magnetic field can also create optical rectification. The light must be shone through a 60 that does not conduct electricity, such as glass. And it must be focused to an intensity of 10 million watts per square centimeter8. Sunlight isnt this 61 on its own, but new materials are being sought that would work at lower intensities, Fisher said.
In our most recent paper, we show that incoherent light9 like sunlight is theoretically almost 62 effective in producing charge separation as laser light is, Fisher said.
This new 63 could make solar power cheaper, the researchers say. They predict that with improved materials they could achieve 10 percent efficiency in converting solar power to useable energy. Thats equivalent to todays commercial-grade solar cells.
To manufacture modem solar cells, you have to do 64 semiconductor processing, Fisher said. All we would need are lenses to focus the light and a fiber to guide it. Glass works for 65 .Its already made in bulk, and it doesnt require as much processing. Transparent ceramics might be even better.
51. A. disc B. fiber C. instrument D. battery
答案:D
52. A. applications B. components C. resources D. differences
答案:B
53. A. concerned B. ignored C. expected D. noticed
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