Question

why cannot wave nature of light explain the photoelectric effect?

Answer 1

Photoelectric effects shows that when radiation of light is put on the photosensitive metal plate of having low threshold energy then particle of that plate starts moving towards positive terminal of battery. This experiment tells only about particle nature of light it didn't explain any interference ,diffractions etc phenomena. So from this experiment we can talk about wave nature of lite

Answer 2

Solution :-

Particle nature of light can be verified by photoelectric experiment.

Let us suppose light to be a wave then, when it is incident on a metal surface and interact with electrons, it will take time to provide energy to the electrons and also, any intensity of the incident wave is able to provide sufficient energy to electrons (though less intensity waves might take time), so that electrons emit out of the metal surface.

But actually it doesn't happens,

The case is that there is negligible time lag between photon collisions with metal and photoelectron emission irrespective of intensity of incident light.(Incident light intensity should be greater than threshold frequency of the metal)

This proves that light show particle nature or, quantum nature.

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