Physics - Modern Physics Question with Solution | TestHub

According to Einstein's photoelectric equation, the maximum kinetic energy of emitted photoelectrons is given by:

$E=h\nu -\Phi$

where $h$ is Planck's constant, $\nu$ is the frequency of incident radiation, and $\Phi$ is the work function of the material.

From this equation, it is clear that the maximum kinetic energy ($E$) depends only on the frequency of the incident radiation and the nature of the material. It is completely independent of the intensity ($I$) of the incident radiation, provided the frequency is above the threshold frequency.

Therefore, the graph between maximum kinetic energy ($E$) and intensity ($I$) will be a straight horizontal line parallel to the intensity axis. Line P correctly represents this behavior.

Answer: P