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Photoelectric effect support the quantum nature of light because

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Even when the metal surface is faintly illuminated by light of wavelength less then the threshold wavelength, the photoelectric leave the surface immediately

The maximum KE of photoelectric depend only on the frequency of light and not on its intensity

There is a minimum frequency of light below which no photoelectrons are emitted

Electric charge of photoelectrons is quantized

answer is A, B, C.

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Existence of cut-off frequency and photoemission takes place even when intensity

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