Hi Nandkishore,
from Einstein's Photoelectric equation,
hv = hvo + KEmax
Also,
KEmax = eV where V is the stopping potential
so, hv = hvo + eV
v = (e/h)V + vo (dividing by h)
comparing this equation by equation of straight line, y = mx + c where m is the slope.
e/h = slope
Also, slope = ab/cb (from the figure)
e/h = ab/cb
so, h = e(cb/ab)
Hope you understand this explanation. Let me know if you have any doubt.
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