First slide

Photo Electric Effect

Question

The figure shows different graphs between stopping potential ( $V_{o}$ ) 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 $V_{0}$ and v cut the v-axis at $V_{0}$ .
For the given graphs ${(v_{o})}_{(iv)} > {(v_{o})}_{(iii)} > {(v_{o})}_{(ii)} > {(v_{o})}_{(i)}$
$∴ {(W_{o})}_{(iv)} > {(W_{o})}_{(iii)} > {(W_{o})}_{(ii)} > {(W_{o})}_{(i)}$

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