WB JEE 2017 | Dual Nature of Radiation Question 7 | Physics

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

When light of frequency v₁ is incident on a metal with work function W (where hv₁ > W), then photocurrent falls to zero at a stopping potential of V₁. If the frequency of light is increased to v₂, the stopping potential changes to V₂. Therefore, the charge of an electron is given by

$${{W({v_2} + {v_1})} \over {{v_1}{V_2} + {v_2}{V_1}}}$$

$${{W({v_2} + {v_1})} \over {{v_1}{V_1} + {v_2}{V_2}}}$$

$${{W({v_2} - {v_1})} \over {{v_1}{V_2} - {v_2}{V_1}}}$$

$${{W({v_2} - {v_1})} \over {{v_2}{V_2} - {v_1}{V_1}}}$$

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