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Why would one expect metals to demonstrate the photoelectric effect more than crystalline solids?

Why would one expect metals to demonstrate the photoelectric effect more than crystalline solids?

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Since in the crystalline solids there are band structures of energy levels of electrons.So there is a possibility of observing internal photoelectric effect which occurs when electrons get energy from the absorption of photon and then electrons make transitions from valence band to conduction band.So here electrons are not ejected from material surface but is internally able to flow forming a photo current or is able to modi the material conductivity. So we would prefer to metals to explain the photoelectric effect.

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