Q.
According to Einstein's photoelectric equation, the plot of the kinetic energy of the emitted photoelectrons from a metal Vs the frequency, of the incident radiation gives a straight line whose slope
Einstein's photoelectric equation is KEmax=hv−ϕ ...(i)
The equation of line is y=mx+c ...(ii)
Comparing above two equations m=h,c=−ϕ
Hence, slope of graph is equal to Planck's constant (non-variable) and does not depend on intensity of radiation.