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Devisharan
In the photo electric effect the current will start to flow after a certain frequency called threshold frequency while the Intensity of light whatever. After threshold frequency i.e. after flow the current the value of current depends on Intensity of light i.e. current is increased with increasing the Intensity and vice-versa. in given question the intensity is constant and value of frequency reduced from this after a certain value of frequency current will not flow. So option C is correct.