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(C) Einstein's photoelectric equation is given by $K_{max} = h
u - \phi$, where $K_{max}$ is the maximum kinetic energy of the photoelectrons, $h$ is

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(C) Einstein's photoelectric equation is given by $K_{max} = h
u - \phi$, where $K_{max}$ is the maximum kinetic energy of the photoelectrons, $h$ is Planck's constant, $
u$ is the frequency of incident radiation, and $\phi$ is the work function of the metal.This equation is of the form $y = mx + c$, where $y = K_{max}$, $x = 
u$, $m = h$ (slope), and $c = -\phi$ (y-intercept).Since the slope $h$ is positive and the y-intercept $-\phi$ is negative, the graph is a straight line that starts from the x-axis at a threshold frequency $
u_0 = \phi/h$ and has a positive slope.Therefore, the graph starts from the x-axis at a positive frequency value.

According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is

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