1.

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.

Answer»

`(i)gt (ii)gt(iii)gt(iv)`
`(i)gt(iii)gt(ii)gt(iv)`
`(iv)gt(iii)gt(ii)gt(i)`
`(iv)=(iii)gt(iii)=(iv)`

SOLUTION :`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.


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