Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions $$\phi_p = 2.0$$ eV, $$\phi_q = 2.5$$ eV and $$\phi_r = 3.0$$ eV, respectively. A light beam containing wavelengths of 550 nm, 450 nm and 350 nm with equal intensities illuminates each of the plates. The correct I-V graph for the experiment is [Take hc = 1240 eV nm]

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