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(D) According to Einstein's photoelectric equation:$E_{k} = h
u - \Phi$where $E_{k}$ is the maximum kinetic energy,$h$ is Planck's constant,$
u$ is

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(D) According to Einstein's photoelectric equation:$E_{k} = h
u - \Phi$where $E_{k}$ is the maximum kinetic energy,$h$ is Planck's constant,$
u$ is the frequency of incident light,and $\Phi = h
u_{0}$ is the work function of the metal surface ($
u_{0}$ is the threshold frequency).This equation is of the form $y = mx + c$,where:$y = E_{k}$$x = 
u$$m = h$ (slope)$c = -\Phi$ (y-intercept)$1$. For $
u $2$. For $
u = 
u_{0}$,$E_{k} = 0$.$3$. For $
u > 
u_{0}$,$E_{k}$ increases linearly with frequency $
u$.Graph $D$ correctly shows that $E_{k}$ is zero until the threshold frequency $
u_{0}$ is reached,after which it increases linearly.

Which one of the following graphs correctly represents the variation of maximum kinetic energy $(E_{k})$ of the emitted electrons with frequency $(\nu)$ of incident light in the photoelectric effect?

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