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Photoelectric effect experiments are per...

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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The correct Answer is:
A
550 nm light cannot emit electron for metal of work function `phi=3eV`, so saturate current decreases for P to Q to R. Also `|V_(sp)| gt |V_(sq)| gt |V_(sr)|`
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