A photocell is connected to a variable power supply. The metal plate in the photocell is illuminated by violet light of wavelength 400 nm. As the voltage V of the power supply varies, the photoelectric current I changes. A graph of I against Vis plotted below. -0.75 0 VIV (a) What is the maximum kinetic energy of the photoelectrons emitted from the metal plate? Express the answer in eV. (b) State the meaning of work function. (1 mark) (1 mark) (c) Find the work function of the metal plate in the photocell. Express the answer in eV. (3 marks) (d) Determine whether the photoelectric effect would occur if green light of wavelength 500 nm is incident on the metal plate. (3 marks) (e) If the intensity of the original light source is halved, sketch the corresponding curve on the same graph (2 marks)