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Statement I : Threshold frequency supports wave nature of light. Statement II : Photo electrons are not emitted when incident light has frequency lesser than threshold frequency.

The fig. shows the variation of photon current with anode potential for a photo-senstive surface for three different radiation. Let I_(a), I_(b) and I_(c) be the intensities and f_(a), f_(b) and f_(c) be the frequency for the curves a,b and c respectively.