Solution
the saturation current generated in photoelectric effect depends on intensity of light, not in the frequency of light. So if we change the frequency of incident light, without changing the intensity, then the saturation current remains the same.
now from Einstein's theory of photoelectric effect,

now K.E. of the electron =$e{V}_{0}$
Where Vis the stopping potential
Now if frequency changes, the L.H.S. of the equation changes.
Now, workfunction of the material is the characteristic property of the material so it doesn't change with time.
Hence, the stopping potential changes with the frequency of incident light change.
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