Q. According to Einsteins photoelectric equation the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

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According to Einsteins photoelectric equation the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

Solution:

Compare the Einsteins photo- electric equation with the equation of straight line.

Einsteins photoelectric equation is

$ KE=hv-phi $ …(i)

where $ phi = $ work function of metal

Comparing above Eq. (i) with equation of a straight line

$ y=mx+c $ we get $ m=h,c=-phi $

Therefore, if we draw a graph between kinetic energy and frequency, then a straight line cutting the frequency axis at

$ {{v}_{0}} $ and giving an intercept of (-(|)) on the kinetic energy axis, is obtained.