Quantum Theory

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• 与电子相反，光子是玻色子。事实证明，玻色子行为恰与费米子行为相反。对于玻色子，没有不相容原理！玻色子喜欢待在相同的状态。它们与南欧人类似，乐意挤在同一节火车车厢中，而费米子则像北欧人，喜欢独自分散在整个列车上。玻色子的这个亲密现象，在最极端形式下，会引起在单个状态上一定程度的聚集，该现象叫作玻色凝聚。这个性质正是激光器等技术设备背后的原理。 (查看原文)

  Jim Moriarty 1 回复 1赞 2019-04-25 11:04:20

• Within a year, Max Planck, now a professor of physics in Berlin, had found a remarkable way out of the dilemma. He told his son that he believed he had made a discovery of equal significance to those of Newton. It might have seemed a grandiose claim to make, but Planck was simply speaking the sober truth. Classical physics considered that radiation oozed continuously in and out of the black body, much as water might ooze in and out of a sponge. In the smoothly changing world of classical physics, no other supposition seemed at all plausible. Yet Planck made a contrary proposal, suggesting that radiation was emitted or absorbed from time to time in packets of energy of a definite size. He specified that the energy content of one of these quanta (as the packets were called) would be proporti... (查看原文)

  [已注销] 2011-04-26 20:55:20

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