The figure shows different graphs 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

Options

A. `(i) gt (ii) gt (iii) gt (iv)`
B. `(i) gt (iii) gt (ii) gt (iv)`
C. `(iv) gt (iii) gt (ii) = (iv)`
D. `(i) = (iii) gt (ii) = (iv)`

Answer

C

Explanation

The graph between `V_(0)` and `v` cut the `v` - axis at `v_(0)`.
For the given graphs `(v_(0))_(iv) gt (v_(0))_(iii) gt (v_(0))_(ii) gt (v_(0))_(i)`
`:.(W_(0))_(iv) gt (W_(0))_(iii) gt (W_(0))_(ii) gt (W_(0))_(i)`.