Q. The figure shows different graphs between stopping potential $(V_{0})$ and frequency $(v)$ for photosensitive surface of cesium, potassium, sodium and lithium. The plots are parallel. Correct ranking of the targets according to their work function greatest first will be
A) $(i) > (ii) > (iii) > (iv)$
B) $(i) > (iii) > (ii) > (iv)$
C) $(iv) > (iii) > (ii) < (i)$
D) $(i) = (iii) > (ii) = (iv)$
Explanation
(c) The graph between $V_{0}$ and $v$ cuts the $v$-axis at $v_{0}$
For the given graphs $\left( v_{0} \right)_{(iv)} > \left( v_{0} \right)_{(iii)} > \left( v_{0} \right)_{(ii)} > \left( v_{0} \right)_{(i)}$
$\therefore\left( W_{0} \right)_{(iv)} > \left( W_{0} \right)_{(iii)} > \left( W_{0} \right)_{(ii)} > \left( W_{0} \right)_{(i)}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.