AIIMS 2017 Physics Photoelectric Effect MCQ Question

Option A is correct because it correctly applies the formula $V_r = \frac{1}{e} \left( \frac{hc}{\lambda} - f \right)$ with the values $\lambda = 350 \, \text{nm}$ and $f = 3$. Substituting these values yields $V_r = \frac{1}{e} \left( \frac{1240}{350} - 3 \right) \approx 0.5428 \, \text{V}$, which matches the calculated result. The other options are not applicable or do not provide valid calculations based on the given parameters, thus making them irrelevant in this context.