Single Choice

The figure shows different graph 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$$(iv) > (iii) > (ii) >(i) $$
Correct Answer
D$$(i) = (iii) > (ii) =(iv) $$

Solution

The graph between $$v_0$$ and $$v$$ cut the $$v-axis$$ at $$v$$.
For the given graphs $$(v_0)_{(iv)} > (v_0)_{(iii)} > (v_0)_{(ii)} > (v_0)_{(i)}$$
$$\therefore (W_0)_(iv) > (W_0)_(iii) > (W_0)_(ii) > (W_0)_(i)$$

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