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(A) According to Einstein's photoelectric equation,the maximum kinetic energy $(KE)_{\max }$ of emitted photoelectrons is given by: $(KE)_{\max } = h\

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is the same for all metals and independent of the intensity of radiation

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(A) According to Einstein's photoelectric equation,the maximum kinetic energy $(KE)_{\max }$ of emitted photoelectrons is given by: $(KE)_{\max } = h
u - \phi_0$,where $h$ is Planck's constant,$
u$ is the frequency of incident radiation,and $\phi_0$ is the work function of the metal.Comparing this with the equation of a straight line $y = mx + c$,where $y = (KE)_{\max }$ and $x = 
u$,we get the slope $m = h$.Since $h$ (Planck's constant) is a universal constant,the slope of the $(KE)_{\max }$ versus $
u$ graph is the same for all metals and is independent of the intensity of the incident radiation.

According to the photoelectric effect,the plot of kinetic energy of the emitted photo-electrons from a metal versus the frequency of the incident radiation gives a straight line whose slope

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