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In a photoelectric effect experiment, photons of energy $5 e V$ are incident on the photo-cathode of work function $3 e V$ . For photon intensity $I_{A} = 10^{15} m^{- 2} s^{- 1}$ , saturation current of $4.0 μ A$ is obtained. Sketch the variation of photocurrent $i_{ρ}$ against the anode voltage $V_{a}$ in the figure below for photon intensity $I_{A}$ (curve $A$ ) and $I_{B} = 2 \times 10^{15} m^{- 2} s^{- 1} (c u r v e B)$ .

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