Physics - Can the wave model explain the photoelectric effect
Can the wave model explain the photoelectric effect
No. The wave model is unable to explain the photoelectric effect. In
particular the wave model predicts that:
* Any frequency of light should cause photoelectrons to be emitted
provided the intensity is great enough.
* In fact there is a threshold light frequency. Light below this
threshold frequency will not cause photoelectrons to be emitted no matter
what the intensity.
* The maximum energy of the ejected electrons should increase with
* Experiments show that greater intensity leads only to more
photoelectrons. maximum energy does not change.
* That once light hits the plate, there should be a time delay before the
first photoelectrons are emitted. During this time the electrons should
absorb wave energy until they have sufficient energy to be ejected. This
should be particularly noticeable with low light intensities where the
light energy is supplied more slowly.
* There is actually no time delay between the time when light strikes the
plate and the emission of photoelectrons.
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