First slide

Photoelectric effect and study of photoelectric effect

Question

The figure shows different graphs between stopping potential (V₀) 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

Easy

A

(i) > (ii) > (iii) > (iv)
B

(i) > (iii) > (ii) > (iv)
C

(iv) > (iii) > (ii) > (i)
D

(i) = (iii) > (ii) = (iv)

Solution

The graph between V_o and v cut the x-axis at v₀.
For the given graphs ${(v_{0})}_{(iv)} > {(v_{0})}_{(iii)} > {(v_{0})}_{(ii)} > {(v_{0})}_{(i)}$
Since, $W o r k f u n c t i o n = W_{0} = h ν_{0}$
$∴ {(W_{0})}_{(iv)} > {(W_{0})}_{(iii)} > {(W_{0})}_{(ii)} > {(W_{0})}_{(i)}$

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