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Consider the following statements regard...

Consider the following statements regarding the photoelectric effect experiment :
(I) Photoelectrons are emitted as soon as the metal is exposed to light
(II) There is a minimum frequency below which no photo-current is observed
(III) The stopping potential is proportional to the frequency of light
(IV)The photo-current varies linearly with the intensity of the light
Which of the above statements indicate that light consists of quanta (photons) with energy proportional to frequency ?

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