Photoelectric effect experiments are performed using three different metal plates $p, \quad q$ and $r$…
Photoelectric effect experiments are performed using three different metal plates $p, \quad q$ and $r$ having work functions $\varphi_p=2.0 \mathrm{eV}, \varphi_q=2.5 \mathrm{eV}$ and $\varphi_r=3.0 \mathrm{eV}$, respectively. A light beam containing wavelengths of $550 \mathrm{~nm}$, $450 \mathrm{~nm}$ and $350 \mathrm{~nm}$ with equal intensities illuminates each of the plates. The correct $I-V$ graph for the experiment is
Solution
intensity is same for all the wavelengths, hence current would remain same.The difference between the energy of photon and work function is proportional to the stopping potential.the difference would be greatest for p plate.
