Which of the following cannot be explained on the basis of photoele...

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Which of the following cannot be explained on the basis of photoelectric theory?
I. Instantaneous emission of photoelectrons
II. Existence of threshold frequency
III. Sufficiently intense beam of radiation can emit photoelectrons
IV. Existence of stopping potential
(a) III and IV
(b) II, III and IV
(c) III only
(d) II only
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