Question
Select the correct statement about electric charge
Quantization of charge.
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$(I)$ 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?