Suppose you perform an experiment on the photoelectric effect using light with a frequency high enough to eject electrons. If the frequency of the light is increased while the intensity is held constant, describe whether the following quantities increase, decrease, or stay the same:
(a) The maximum kinetic energy of an ejected electron;
(b) The minimum de Broglie wavelength of an electron;
(c) The number of electrons ejected per second;
(d) The electric current in the phototube?