What are Einstein's 3 postulates for Photo electric effect?

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SUMMARY

Einstein's three postulates regarding the photoelectric effect are foundational to quantum physics. They assert that photoelectrons are emitted only when the frequency of incident light exceeds a specific threshold frequency, indicating that the energy of the photon must surpass the work function. Additionally, while increasing the intensity of light raises the number of emitted photoelectrons, it does not affect their kinetic energy. These principles underscore the quantized nature of light and energy, building on Max Planck's earlier work on discrete energy packets.

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uzman1243
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There are certain conclusions that can be explained by quantum physics about the photoelectric effect:
1) photoelectrons only emitted if frequency>threshold frequency and hence energy of photon> work function
2)Increasing intensity increases no. of photons (and thus photoelectrons provided f>f0 ) and NOT the kinetic energy

But what are the actual postulates (3) proposed by Einstein?
Something like electron discrete energy packets (i'm not really sure).
Can you help me out
 
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The discrete energy packets where as far as I know originally postulated by Max Planck who found a equation that discribes the black body radiation after Wien and ralley jeans law where thought of. But Einstein cirtenly did work on energy levels, I do not doubt that.
 

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