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JINLING Chen
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KIM Chen
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Subject: Automotive LED-R5W 9CSMD
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2009-12-18 |
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Light
quantum hypothesis to explain the success of the photoelectric effect.
When this type of UV light at wavelengths shorter exposure of metal
surface, the metal is an electronic escape, a phenomenon called the
photoelectric effect. It is by Hertz (HRHertz l857-1894) and Lenard (P.
Lenard l862-1947) found. The experimental results show that
photoelectric effect: a weak purple from the metal surface play
electronics, and a strong red light can not play electronic, the
photoelectric effect that is produced depends only on the frequency of
light with the intensity of light has nothing to do. Fluctuations in
light of this phenomenon that can not explain. Because the wave theory
of light that just a wave, its energy is continuous, and the amplitude
of the intensity of light waves, while the frequency of the color and
light has nothing to do, if the faint purple shot electrons from the
metal surface, then the strong The red light should be more outgoing
electrons, and in fact shows the opposite. The use of light quantum
hypothesis can satisfactorily explain the photoelectric effect.
Accordance with the light quantum hypothesis, merely formed by a light
quantum, the light energy is not continuous, each light quantum of
energy must reach a certain value in order to overcome the work
function of electrons from the metal surface to play electronics. Faint
purple Although the numbers were small, but each light quantum of
energy is large enough, so electrons from the metal surface play; a
strong red light, the number of photons Although many, but each light
quantum of energy is not big enough, less than to overcome the
electronic Yat dispatched, we can not play electrons.
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