Question

The figure shows different graphs between stopping potential $\left(V_{0}\right)$ 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)

Answer 1

Answer: (C)

The graph between $V_{0}$ and $v$ cut the $v$ -axis at $v_{0}$.
For the given graphs
$\left(v_{0}\right)_{( iv )}>\left(v_{0}\right)_{( iii )}>\left(v_{0}\right)_{( ii )}>\left(v_{0}\right)_{( i )}$
$\therefore \left(W_{0}\right)_{( iv )}>\left(W_{0}\right)_{( iii )}>\left(W_{0}\right)_{( ii )}>\left(W_{0}\right)_{( i )}$