IIT JEE Advanced 2009 Paper 2

Photoelectric effect experiments are performed using three different metal plates p, q and r having work functions ϕp = 2.0 eV, ϕq = 2.5 eV and ϕr = 3.0 eV, q r 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)