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A metal surface in an evacuated tube is ...


A metal surface in an evacuated tube is illuminated with monochromatic light causeng the emission of photoelectrons which are collected at an adjacent electrode. For a given intensity of light, the in which the photocurrent I depends in the potential difference V between the electrodes is shown by approximate graphi in Fig. If the experiment were repeated with light of twice the intensit but the same wavelength, which of the graphs below would best represent the new relation between I and V? (In these graphs, the result of the original experiment is idicated by a broken line.)

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