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Photoelectric effect experiments are performed using three different metal plates p comma q and r having work functions ϕ subscript p end subscript equals 2.0 e V comma ϕ subscript q end subscript equals 2.5 e V and ϕ subscript r end subscript equals 3.0 e V, respectively. A light beam containing wavelengths of 550 text end text n m comma 450 text end text n m and 350 text end text n m with equal intensities illuminates each of the plates. The correct I minus V graph for the experiment is:
(Take hc equals 1240 e V n m )

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  2.    
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The correct answer is:

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