Q.

The figure shows different graphs between stopping potential (Vo)  and frequency ν 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 Voand ν cut the ν-axis at νo.
For the given graphs :

ν0iv>ν0iii>ν0ii>ν0i

W0iv>W0iii>W0ii>W0i

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