For metals cesium ,potassium ,sodium and lithium graph of stopping potential (`V_(0))to` frequency (v) is shown in figure .These graph are parallel.Arrange work function from lerger to smaller value.

Options

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

Answer

C

Explanation

`V_(0)tov` graph has intercept of threshold.
`therefore` From given graph,
`(v_(0))_(iv)gt(v_(0))_(iii)gt(v_(0))_(ii)gt(v_(0))_(i)`
and work function W=`hv_(0)`
`(W_(0))_(iv)gt(W_(0))_(iii)gt(W_(0))_(ii)gt(W_(o))_(i)`
`therefore`Option (C )is true.