The figure shows different graphs between stopping potential (Vo) 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
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a
(i) > (ii) > (iii) > (iv)
b
(i) > (iii) > (ii) > (iv)
c
(iv) > (iii) > (ii) > (i)
d
(i) = (iii) > (ii) = (iv)
answer is C.
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Detailed Solution
The graph between V0 and v cut the v-axis at V0. For the given graphs voiv>voiii>voii>voi∴Woiv>Woiii>Woii>Woi